EleventhEdition
EricWise
SantaBarbaraCityCollege
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EricWise
SantaBarbaraCityCollege
Copyright©2017McGraw-HillEducation.Allrightsreserved.Noreproductionordistribution withoutthepriorconsentofMcGraw-HillEducation.
Thisinstructor'sresourcemanualwaswrittentoassistyouinthepreparationofthelabportionofthecourse.It servestocoordinatethelabswiththeorderingofmaterial,aidtheinstructororlabtechnicianinpreparingmaterial forthelab,provideadetailedlistofpreparationsandsourcesfororderingandinstructionalaidsintherunningofthe lab.Thismanualalsoprovidesanswerstothereviewquestionsatthebackofeachexercise.
Thelabmanualcontains43exercisesthatcoverthebreadthofhumananatomyandphysiology.Eachexercisecan beusedinitsentiretyorshorteneddependingonthetimeavailableoraccordingtoyourinterest.Labsvaryinterms ofequipment.Someexercisesmayneedtobemodifiedordeletedentirelyduetothephysicalconstraintsofthe institution.Thetextiswrittenforstudentswhoareintroductorystudentstothematerialandmayhavelittleorno chemistrybackground.
Ordersmustbemadeaheadoftimeforitemssuchassterilizedblood,livefrogs,enzymes,andothermaterialsfor thepreparationofsolutions.Manysupplycompanieswilltakeordersearlyandshipmaterialtoarriveatthe scheduledtime.Aslabsarebeingprepared,specificquantitiesofmaterialsneedtobeprepared.Ageneralruleof thumbistocalculatethetotalamountofmaterialthatwillbeusedinlabanddoublethatamount.
Materialslistedinthislabmanualaregenerallyindicatedasperstudent,pertable(assumingatableof4),orperlab section(25students).Testallreagentsandexperimentspriortotryingtheminlab.Noteanymodificationstothe experimentsforfutureuse.Iwouldbeveryhappytohearfromyourregardingcommentsorsuggestionsconcerning thelab.YoucancontactmethroughMcGraw-HilloratSantaBarbaraCityCollege.
Instructor'sresourcessuchasPowerPointreviewsattheendoflab,videos,computerpresentations,additionaltexts orillustrationsaddtostudents’comprehensionofthematerial.Somestudentswanttogobeyondthematerialat handandavailablereferencesarewonderfultohaveinthelab.
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Safetyinthelabisoneoftheprimaryconcernsofanyinstructorteachinganatomyandphysiology.Safety guidelinesareprintedinthelabmanualandshouldbethoroughlycoveredbytheinstructorpriortobeginningthe lab.Severalpotentialhazardsoccurinthelabincluding:
1.Sharpobjectssuchasbrokenglassware,razorblades,scalpelbladesandotherpotentiallydangerouscutting orpuncturingobjects.Properdisposalofsharpobjectsisessentialasisthehandlingoftheseobjects.
2.Infectiousdiseases-studentsshouldwearbarrierglovesandprotectiveeyewearwhenhandlingbodily fluids.Studentsshouldhandleonlytheirownfluidsunlesscloselysupervisedbytheinstructororother qualifiedpersonnel.Studentsneedtobepreparedtoworkwithinfectiousagents.Thosestudentsentering thehealthprofessionwillpotentiallyencounterlethaldiseasesintheirprofessionandanearlyprotocolthat influencessafetyshouldconstantlybestressed.Evenifyouknowmaterialisnon-pathogenic,students shouldtreatitasifitis.Materialthathascomeintocontactwithbodilyfluidsmustbeplacedina10% bleachsolutionordepositedinasharpscontainer.
3.Disposalofanimalwastes–Properdisposalofanimalwasteiscritical.Ifyourinstitutiondoesnothavean incineratoryoushouldcheckwithuniversitiesnearbyoranimalcontrolfacilities.Materialpreservedwith formaldehydeshouldnotbedisposedofinlocallandfills.
4.Flamesorhotsurfaces-Mostoftheexperimentsrequiringheatingintheseexercisescanbedoneusinghot plates.Itisimportanttouseheat-proofglasswareonthehotplates.Glassfingerbowlsandhouseholdjars arenotheatproofandshouldnotbeheatedonhotplates.
5.Toxicmaterials-Someofthematerialinlabistoxic.Studentsshouldnoteatfoodinlabandmakesure theywashtheirhandsafterhandlingmaterialinlab.Spillsmustbecleaned-upimmediately.Allreagents usedinlabthatarepotentiallydangerousshouldhaveamanufacturer’ssafetydatasheet(MSDS)thatcan beconsultedifspillsoccur.
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ThislabmanualwaswritteninconjunctionwithSeeley’sAnatomyandPhysiology,11thedition.Ihaveprovided correlationsbetweentheLecturetextandtheLabManual,yetthelabmanualcanbeusedwithanystandardcollege anatomyandphysiologytext.
ChaptersinSeeley’sAnatomyandPhysiology,11th edition,byVanPutte,etal.
1TheHumanOrganism
2TheChemicalBasisofLife
3StructureandFunctionoftheCell
4Histology:TheStudyofTissues
CorrespondingExercisesinAnatomyandPhysiology LaboratoryManual,byEricWise
1IntroductiontoLabScience,Chemistry,Organs, Systems,andOrganizationoftheBody
1IntroductiontoLabScience,Chemistry,Organs, Systems,andOrganizationoftheBody
2Microscopy
3CellStructureandFunction
4Tissues
5IntegumentarySystem 5IntegumentarySystem
6SkeletalSystem:BonesandBoneTissue 6IntroductiontotheSkeletalSystem
7SkeletalSystem:GrossAnatomy
7AppendicularSkeleton 8AxialSkeleton:Vertebrae,Ribs,Sternum, Hyoid 9AxialSkeleton-Skull
8ArticulationsandMovement 10Articulations
9MuscularSystem:HistologyandPhysiology 11MusclePhysiology
10MuscularSystem:GrossAnatomy
11FunctionalOrganizationofNervousTissue
12SpinalCordandSpinalNerves
13BrainandCranialNerves
14IntegrationofNervousSystemFunctions
15TheSpecialSenses
16AutonomicNervousSystem
12OverviewofMusclesand MusclesoftheShoulderandUpperExtremity 13MusclesoftheHip,Thigh,LegandFoot 14MusclesoftheHeadandNeck 15MusclesoftheTorso
16IntroductiontotheNervousSystem 19NervousSystemPhysiology-Stimuliand Reflexes
18SpinalCordandSomaticNerves
17BrainandCranialNerves
19NervousSystemPhysiology-Stimuliand Reflexes
20IntroductiontoSensoryReceptors
21TasteandSmell
22EyeandVision
23Ear,Hearing,andBalance
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17FunctionalOrganizationoftheEndocrine System
18EndocrineGlands
19CardiovascularSystem:Blood
20CardiovascularSystem:TheHeart
30IntroductiontoBloodVesselsandArteriesof theUpperBody
21CardiovascularSystem:PeripheralCirculation andRegulation
22LymphaticSystemandImmunity
Thislabintroducesthestudenttothefieldsofanatomyandphysiology,discussesscienceasageneralfieldofstudy, andprovidesaverybasicintroductiontochemistry.The"scientificmethod"isadescriptionofabroadnumberof proceduresandexperimentaltechniques.Thegoalsofvalidsciencehavecriteriaofexperimentalrepeatabilityand priorpublicationrightsthatarefollowedbymembersofthescientificcommunity.
Termssuchashypothesis,controlgroup,experimentalgroup,theory,andlawcanhelpstudentsdistinguishthe specificparametersofscientificstudyfromwhatiscommonlyperceivedassciencebythelayperson.Another importantareafordiscussionisthetopicofhonestyinscience.Courtcasesinvolvinginterpretationofdataby"paid consultants"hasblurredtheobjectivityofthescientificexperienceyetgooddiscussionscanbehadbyopening-up thetopicofhonestyinthecommercialdevelopmentofnewdrugsandtheneedforhonestappraisalofone'swork whentheeffortsofscienceareusedforpurposesthatconcernthehealthorwell-beingofpeople.
Anotherpartofthelabistointroducethestudenttotheideaofdatacollection,workingwithdata,graphingresults andinterpretingthedatainaverysimpleformat.Somestudentswillhavenodifficultywiththenumericalportion oftheexercisewhileothersmayfeelfrustrated.Itisagoodtimetomakeanearlyevaluationofstudents' relationshipstomathandthepotentialneedforanaugmentationoftheireffortsinmath.Someanatomyand physiologycourseshavechemistryasaprerequisiteandsomedonot.Thislabexerciseinvolvessomebasicand fundamentalconceptsofchemistrybutisnotmeanttocovereventheessentialsofchemistryneededforthecourse. Agoodreferencetothestudyofchemistryisimportantforthosestudentswhohavehadnochemistrybackground.
WhendiscussingtheatomicleveloforganizationhavingavailableMRIgraphicsfromlocalhospitalsorphysicians allowsstudentstoexaminetheimportanceofanatomicstudyfromvariousperspectivesandtechnologies.Itisalso importanttocomparedirectionaltermsforquadrupedswiththoseforhumansassuperiorandinferiorarespecific termsforhumans.Thetermsanterior/ventralandposterior/dorsalaresynonymousinhumanswhiletheanterior endofaquadrupedistowardthenosewhilethedorsalsideisalongthevertebralcolumn.
Planesofsectioningarealsoimportantconceptsinthestudyofanatomy.Illustrationsoforgansthathavebeen sectionedorthinsectionsoforgansembeddedinplasticmakegoodtoolsfordiscussingsectioningplanes.Likewise theuseoftorsomodelsforthediscussionofbodycavitiesprovidesagoodvisualmediumfordemonstration.
Moststudentshaveanintuitivesenseandsomefamiliaritywiththeregionsofthebody.Particularnoticeshouldbe giventospecificanatomictermssuchas"arm"(fromtheshouldertotheelbow)and"leg"(fromthekneetothe ankle).Descriptionsoftheabdominalregionareusuallyeasilyunderstood.Theterm"hypochondriac"comesfrom theGreekwordsmeaning"underthecartilage".Inearliertimesthehypochondriacareawasthoughttobethe centerofmelancholy.
TIME1.5-2hours
Acid/Base
Safetygogglesandgloves
Five10mLtesttubes
Testtuberack
10mLgraduatedcylinder
Permanentmarker
Distilledwaterindropperbottle
0.1MHClindropperbottle
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0.1MNaOHindropperbottle
Bakingsoda(sodiumbicarbonate)
Sodiumchloride(tablesalt)
Wide-rangingpHpaper(pH1-14)
Parafilm®
Smallmetalspatula
Balanceandweighpaper
IonicandCovalentMolecules
18gaugewire
Alligatorclips
9voltbattery
6voltflashlightbulb
Miniaturescrewlampreceptacle(Carolina#756481orSargentWelch#CP33008-00)
Two50mLbeakers
15%sucrosesolutionindropperbottle
15%sodiumchloridesolutionindropperbottle
HydrogenBonds
Graduatedcylinder
Two50mLbeakers
Smallbottleofdistilledwater
Smallbottleofethanol(70%orgreater)
Hotplate(donotuseopenflame)
HeartRateandExercise
Clockorwatchwithaccuracyinseconds
Calculator
OrganSystemsSection
ModelsofHumanTorso
ChartsofHumanTorso
ANSWERSTOIN-TEXTQUESTIONS
Page2
1centigram 1kilosecond 1decameter 1nanoliter
4.3X106
3.4X10-5
2.2X103 1.9X10-3
Figure1.8 1.Respiratory 2.Urinary 3.Nervous 4.Muscular 5.Reproductive(female) 6.Skeletal
7.Lymphatic
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8.Integumentary 9.Digestive 10.Endocrine 11.Cardiovascular
Page14
Findthefollowinglocationsonyourbodyandprovidetheappropriateanatomicaldescriptionfortheseregions. Shin Crural Elbow Cubital Neck Cervical Toes Digital Shoulder Acromial Thigh Femoral Kneecap Patellar
1.Intermsofbaseunits
a.Themeteristhebaseunitoflengthinthemetricsystem.
b.Theliteristhebaseunitofvolumeinthemetricsystem?
2.Cubiccentimetersandmillilitersareinterchangeable,thereforethereare200cubic centimetersin200mL
3.Thereare1000mginonegramsotherewouldbe0.35gramsofmedicationin350mg.
4.3.45X10-4litersis0.000345literinscientificnotation.
5.Thereare4,500,000milligramsin4.5kilograms.
6.0.25meters
7.Ifgivenalengthof1/10,000ofameter
a.0.0001
b.1X10-4
8.Useawordtodescribe
a.Amillisecondisone-thousandthofasecond:
b.Akiloliterisone-thousandliters:
c.Acentimeterisone-hundredthofameter:
9.Determinedbyexperimentation.Heartrategenerallyincreaseswithexerciseuptoacertainpoint.Thereisa maximumheartratesothetrendwouldnotcontinue.
10.Inthiscase,exerciseistheindependentvariableandheartrateisthedependentvariable.
11.Determinedbyexperimentation
12.AchemicalthatdampensthechangeinpHwhenacidorbaseisaddedtosolution
13.7istheneutralpH
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14.ApHof8ismorebasicthanapHof6
15.Thehydrogenionconcentrationincreases
16.Solutionswithmoreelectrolytesconductelectricitymoreeasilythansolutionsofpurewater.
17.Covalentbonds
18.Hydrogenbondsareweakbonds
19.physiology
20.organsystems
21.anatomicalposition
22.abdominalcavity
23.thoraciccavity
24.pelviccavity
25.a.shoulderandelbow
26.b.kneeandankle
27.c.organelle
28.epigastricandrighthypochondriac
29.superior
30.distal
31.deep
32.anterior/ventral
33.respiratory
34.digestive
35.muscular
36.d.dorsal
37.Theabdomenistheregionofthebellyandtheabdominalcavityisaspaceintheabdominalregion.
38. a.cervical b.acromial c.pectoral d.axillary e.brachial f.abdominal
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g.antebrachial h.carpal
i.genital j.femoral k.crural
l.pedal
m.cephalic n.frontal
o.sternal p.coxal
39. a.midsagittal(median)
b.transverse
c.frontal
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Microscopyandbeginningstudentsareaninterestingcombination.Inanyintroductoryscienceclassthereare usuallystudentswhohavehadnoexperiencewithmicroscopes,thosewhohavehadsomeexperience(butithas beenlimited,orwithothertypesofmicroscopesthanthosefoundinthisparticularlab),andstudentswithquiteabit ofmicroscopeexperience.Anotherinterestingfactoristhegreatreluctanceonthepartofmanystudentstoadmit thattheydonotknowhowtouseamicroscope(ordonotknowhowtouseitcorrectly).
Itisworththeefforttodoademonstrationofthemicroscopebeforelettingstudentsusetheinstruments.Frequently whentheyhaveamicroscopeattheirdesksandyouaredemonstrating,theypaynoattentiontoyoubutfiddlewith themechanismsinfrontofthem.Oncetheyhavebeenshownthemicroscopeandlearnthepartsthentheyseemto haveaneasiertimewiththeexercise.
DiscussionsaboutcareofthemicroscopevaryfrominstructortoinstructorbutIthinkthatyoucannotassumethat yourstudentswillknowanythingaboutmicroscopecareunlessyouprovidethemwithspecificguidelines.Someof thesearelistedinthisexercise.Likewisetheknowledgeofthepartsofthemicroscopeisimportant.Studentswho knowthestructureofthemicroscopewillhaveagoodunderstandingofthefunctionsoftheparts.Microscope modelsvarybymanufacturersoyoumaywishtoprovidestudentswithalabeledillustrationofthemicroscopesin yourparticularlab.
TounderstandthefieldofviewIliketohavestudentsmeasureitdirectlyunderlowpower.Clearplasticmetric rulersworkwell.Youcanalsotakestandardmetricrulersandplaceseveralofthemonaphotocopymachineand runapieceofoverheadtransparencyacetatethroughthemachine.Cuttheacetatesheetsintosmall(10-15cm) sections.Studentscanplacethethinstripsofacetateontheirmicroscopestages,examinethemunderlowpower anddirectlymeasurethefieldofview.
Oncetheyhaveobtainedthisvaluetheycanswitchtothenexthigherobjectivelensandmaketheircountto determinethediameterofthefieldofview.Thediameterdecreasesininverseproportiontothemagnificationofthe lens.Thusifthediameteris4mmat40Xthenthediameterwillbe0.4ofthat(or1.6mm)at100X.The magnificationof100Xis2.5timesgreaterthan40Xsothefieldofviewis2.5timessmaller.
Whenworkingwithstudentsinlabitisgoodtohavethemgetstartedontheirmicroscopeworkthenwalkaround theroomtoseeifthestudentshaveputthemicroscopeslidesonthestagecorrectly.Determineiftheyknowhowto adjustthelight,movetheslidearound,focuscorrectly,etc.Sometimesstudentswillnotaskforhelpbutitis apparentfromalittleobservationthattheyneedit.OnequickmethodthatIhaveusedinlabistowalkaroundthe labasstudentsjuststarttoexaminetheirfirstslide.Ifthetipofthehighpowerobjectivelensis3-4cmabovethe mechanicalstageitiseasytodeterminethatstudentsneedalittlehelpfocusingthemicroscope.
Studentsusuallyhavenoproblemwiththepreparationofwetmountsotherthansometimestrappingairbubbles underthecoverslipornotputtingonacoverslipatall.Preparedslidesareeasytobeginwith,thoughmore expensivetoreplacethanthewetmountspreparedinlab.
TIME1.5hours
MATERIALS
Compoundlightmicroscopes
Preparedslidewiththelettere(ornewsprintandrazorblades)
Transparentmetricrulersorsectionsofoverheadacetatesofrulers
Glassmicroscopeslides
Coverslips
Lenspaper
Kimwipesorothercleaningpaper
Lenscleaner
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Smalldropperbottleofwater(1pertable)
1%methylenebluesolution(1partmethylenebluecrystalsin100partsabsolutealcohol) Toothpicks
Histologicalslidesofkidney,stomach,orliver
Silkthreadspreparedslide
1. a.70X b.150X c.200X
2.Coverslip
3.a.compoundmicroscope
4.Fieldofview
5.Tocontroltheamountoflightenteringthemicroscopeandadjustthedepthoffield
6.2.8mm
7. a.ocularlens b.bodytube c.arm
d.coarse-focusknob e.base f.objectivelens g.stage h.lightsource
8.Thereislessworkingdistance.
9.Thefieldofviewdecreaseswithincreasingmagnification.
10.Youshouldusethelow-powerobjectivelenswhenyoufirstexaminethemicroscopeslide.
11.Youshouldcleanthelensesofthemicroscopewithspeciallenspaperbyusingthepaperonce,thenthrowingit away.
12.Itisimportanttocarrythemicroscopeuprightandwithtwohands.
13.Itisapproximately1.5mm
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Afterreadingthischapter,studentsshouldbeableto:
1.1ADefineanatomyanddescribethelevelsatwhichanatomycanbestudied.
1.1BDefinephysiologyanddescribethelevelsatwhichphysiologycanbestudied.
1.1CExplaintheimportanceoftherelationshipbetweenstructureandfunction.
1.2ANamethesixlevelsoforganizationofthebody,anddescribethemajorcharacteristics ofeachlevel.
1.2BListthe11organsystems,identifytheircomponents,anddescribethemajorfunctions ofeachsystem.
1.3AListanddefinethesixcharacteristicsoflife
1.4AExplainwhyitisimportanttostudyotherorganismsalongwithhumans.
1.5ADefinehomeostasisandexplainwhyitisimportantforproperbodyfunction.
1.5BDescribeanegative-feedbackmechanismandgiveanexample.
1.5CDescribeapositive-feedbackmechanismandgiveanexample.
1.6ADescribeapersonintheanatomicalposition.
1.6BDefinethedirectionaltermsforthehumanbody,andusethemtolocatespecificbody structures.
1.6CKnowthetermsforthepartsandregionsofthebody.
1.6DNameanddescribethethreemajorplanesofthebody.
1.6ENameanddescribethethreemajorwaystocutanorgan.
1.6FDescribethemajortrunkcavitiesandtheirdivisions.
1.6GLocateorgansintheirspecificcavity,abdominalquadrant,orregion.
1.6HDescribetheserousmembranes,theirlocations,andfunctions.
1.1AnatomyandPhysiology
1.Anatomyisthestudyofthebody’sstructures.
Developmentalanatomyconsidersanatomicalchangesfromconceptiontoadulthood. Embryologyfocusesonthefirst8weeksofdevelopment.
Cytologyexaminescells,andhistologyexaminestissues.
Grossanatomystudiesorgansfromeitherasystemicoraregionalperspective.
2.Surfaceanatomyusessuperficialstructurestolocatedeeperstructures,andanatomical imagingisanoninvasivetechniqueforidentifyingdeepstructures.
3.Physiologyisthestudyofthebody’sfunctions.Itcanbeapproachedfromacellularora systemspointofview.
4.Pathologydealswithallaspectsofdisease.Exercisephysiologyexamineschanges causedbyexercise.
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1.2StructuralandFunctionalOrganizationoftheHumanBody
1.Basicchemicalcharacteristicsareresponsibleforthestructureandfunctionsoflife.
2.Cellsarethebasicstructuralandfunctionalunitsoforganisms,suchasplantsand animals.Organellesaresmallstructureswithincellsthatperformspecificfunctions.
3.Tissuesarecomposedofgroupsofcellsofsimilarstructureandfunctionandthe materialssurroundingthem.Thefourprimarytissuetypesareepithelial,connective, muscle,andnervoustissues.
4.Organsarestructurescomposedoftwoormoretissuesthatperformspecificfunctions.
5.Organsarearrangedintothe11organsystemsofthehumanbody.
6.Organsystemsinteracttoformawhole,functioningorganism.
1.3CharacteristicsofLife
Humanssharemanycharacteristicswithotherorganisms,suchasorganization, metabolism,responsiveness,growth,development,andreproduction.
1.4BiomedicalResearch
Muchofourknowledgeabouthumansisderivedfromresearchonotherorganisms.
1.5Homeostasis
Homeostasisistheconditioninwhichbodyfunctions,bodyfluids,andotherfactorsofthe internalenvironmentaremaintainedatlevelssuitabletosupportlife.
NegativeFeedback
1.Negative-feedbackmechanismsmaintainhomeostasis.
2.Manynegative-feedbackmechanismsconsistofareceptor,acontrolcenter,and aneffector.
PositiveFeedback
1.Positive-feedbackmechanismsusuallyincreasedeviationsfromnormal.
2.Althoughafewpositive-feedbackmechanismsnormallyexistinthebody,most positive-feedbackmechanismsareharmful.
3.Normalpositive-feedbackmechanismsincludebloodclottingandchildbirth labor.Harmfulpositive-feedbackexamplesincludedecreasedbloodflowtothe heart.
1.6TerminologyandtheBodyPlan
BodyPositions
1.Ahumanstandingerectwiththefacedirectedforward,thearmshangingtothesides, andthepalmsfacingforwardisintheanatomicalposition.
2.Apersonlyingfaceupwardissupine;apersonlyingfacedownwardisprone.
DirectionalTerms
Directionaltermsalwaysrefertotheanatomicalposition,nomatterwhattheactual positionofthebody.
BodyPartsandRegions
1.Thebodycanbedividedintoacentralregion,consistingofthehead,neck,andtrunk, andtheupperlimbsandlowerlimbs.
2.Superficially,theabdomencanbedividedintoquadrantsorintonineregions.These divisionsareusefulforlocatinginternalorgansordescribingthelocationofapainor atumor.
Planes
1.PlanesoftheBody
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Asagittalplanedividesthebodyintorightandleftparts.Amedianplanedivides thebodyintoequalrightandlefthalves.
Atransverse(horizontal)planedividesthebodyintosuperiorandinferior portions.
Afrontal(coronal)planedividesthebodyintoanteriorandposteriorparts.
2.SectionsofanOrgan
Alongitudinalsectionofanorgandividesitalongthelongaxis.
Atransverse(cross)sectioncutsatarightangletothelongaxisofanorgan.
Anobliquesectioncutsacrossthelongaxisofanorganatanangleotherthana rightangle.
BodyCavities
1.Themediastinumsubdividesthethoraciccavity.
2.Thediaphragmseparatesthethoracicandabdominalcavities.
3.Pelvicbonessurroundthepelviccavity.
SerousMembranes
1.Serousmembraneslinethetrunkcavities.Theparietalportionofaserousmembrane linesthewallofthecavity,andthevisceralportionisincontactwiththeinternal organs.
Theserousmembranessecretefluid,whichfillsthespacebetweenthevisceral andparietalmembranes.Theserousmembranesprotectorgansfromfriction.
Thepericardialcavitysurroundstheheart,thepleuralcavitiessurroundthelungs, andtheperitonealcavitysurroundscertainabdominalandpelvicorgans.
2.Mesenteriesarepartsoftheperitoneumthatholdtheabdominalorgansinplaceand provideapassagewayforbloodvesselsandnervestotheorgans.
3.Retroperitonealorgansarelocated“behind”theparietalperitoneum.
Theuseofanimalsinresearchisrelevant,andthestudentsmayhavestrongopinionsaboutthe ethicalissuesinvolved.Discussprosandcons(includingfinancialconsiderations)for alternativestoanimalexperimentation,suchastissuecultureandcomputersimulation.
Anatomicalanomaliescanbeusedfordiscussionconcerningtheconceptofnormal.Anatomy andphysiologyarerepletewithreferencestonormalandabnormalstructuresandvalues. Studentswillbenefitfromtheclarificationofthemeaningoftheword“normal"asitwillbe usedwithinthecontextofthecourse.
Newspaper,magazine,orinternetsourcesrelatedtothenewimagingtechnologiescanhelp studentsappreciatetheamountofknowledgeofanatomyandphysiologyadiagnosticianmust possessinordertointerpretthosepotentiallymeaninglessimages.UsetheClinicalImpact: AnatomicalImaging,asthestartingpointforahomeworkassignmenttofindoutmore information.
Theexcellentphotographsfoundonthefirstpageofeverychapterillustratetechnological advancesinimagingtechniques.Theadventsoftheelectronmicroscope,patch-clamping, micro-electrodes,andradio-immunoassayhaveincreasedourabilitytoinvestigatecellstructures
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andcellmembranetransport.Thenewestscanningtunnelingelectronmicroscopeshavetaken resolutiondowntothelevelofindividualmolecules.Classdiscussioncouldfocusonthe intriguingareaofcellularresearch.TheClinicalImpact:MicroscopicImaging,providesmore information.
“WheninRome…”isaconceptthatcouldbeappliedtoknowingandusinganatomicaland medicalterminology.Studentsmustusetheirlanguageinordertocommunicatewithother scientistsandhealthcareprofessionals.Studentsneedtolearnthatthereisvalueinthe precisionofanatomicalterminology.Thenotionthatthebodyisacollectionofinterlocking partsisaconceptforeigntomanystudents,whoviewthebodyasasingularandsolidentity. Studentsmaynotrealizethereisaconnectionbetweenthewordsthatareusedinclassand theirownbodies.Pointoutthevaluablelistofprefixes,suffixes,andcombiningformsonthe backcoverofthebookandtheGlossary(pagesG-1toG-32)thatwillhelpthemgaina masteryofthis“new”language.AlsousefulisTable1.2,DirectionalTermsforHumans.
Feedback
Spendtimeontheconceptsofpositiveandnegativefeedbacktoensurestudentunderstanding. Provideexamplesinadditiontothoseprovidedinthetext.Askstudentstothinkaboutand thendiscussexamplesofeventsthatpushthebodyoutofhomeostasisandhowthebody returnstohomeostasis.Discusswaysthebodycanbehelpedtoreturntohomeostasisin emergencies.BesurestudentsunderstandhowtointerprettheProcessFigure1.5and HomeostasisFigure1.6,becausethisformatisusedthroughoutthebookandcanbean invaluabletoolinunderstandingcomplexbodyprocesses.
Studentsmustassimilatethisfoundationalknowledgebeforetheycangraspmorecomplex physiologicalprocesseslikecellmembranetransportandcell-to-cellcommunication.Stress thepivotalpositionofcellsandbiochemistryinunderstandinghigherlevelsoforganization.
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Studentsmustgraspthedifferencebetweenstructures/partsandfunctions/processes. Introducetheelementoftimeandthepossibilityofchangethroughtime(momenttomoment, overthelifespan,andevolutionarily)inbothstructuresandfunctions.
Afterreadingthischapter,studentsshouldbeableto:
2.1ADefinematter,mass,andweight.
2.1BDistinguishbetweenelementsandatoms,andstatethefourmostabundantelementsin thebody.
2.1CNamethesubatomicparticlesofanatom,andindicatetheirmass,charge,andlocation inanatom.
2.1DDefineatomicnumber,massnumber,isotope,atomicmass,andmole.
2.1ECompareandcontrastionicandcovalentbonds.
2.1FDifferentiatebetweenamoleculeandacompound.
2.1GExplainwhatcreatesahydrogenbondandrelateitsimportance.
2.1HDescribesolubilityandtheprocessofdissociation,andpredictifacompoundor moleculeisanelectrolyteornonelectrolyte.
2.2ASummarizethecharacteristicsofsynthesis,decomposition,reversible,andoxidationreductionreactions.
2.2BIllustratewhatoccursindehydrationandhydrolysisreactions.
2.2CExplainhowreversiblereactionsproducechemicalequilibrium.
2.2DContrastpotentialandkineticenergy.
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2.2EDistinguishbetweenchemicalreactionsthatreleaseenergyandthosethattakein energy.
2.2FDescribethefactorsthatcanaffecttherateofchemicalreactions.
2.3ADistinguishbetweeninorganicandorganiccompounds.
2.3BDescribehowthepropertiesofwatercontributetoitsphysiologicalfunctions.
2.3CDescribethepHscaleanditsrelationshiptoacidic,basic,andneutralsolutions.
2.3DExplaintheimportanceofbuffersinorganisms.
2.3EComparetherolesofoxygenandcarbondioxideinthebody.
2.4ADescribethestructuralorganizationandmajorfunctionsofcarbohydrates,lipids, proteins,andnucleicacids.
2.4BExplainhowenzymeswork.
2.4CDescribetherolesofnucleicacidsinthestructuresandfunctionsofDNA,RNA,and ATP.
ChapterOutline
2.1BasicChemistry Matter,Mass,andWeight
1.Matterisanythingthatoccupiesspaceandhasmass.
2.Massistheamountofmatterinanobject.
3.Weightresultsfromtheforceexertedbyearth’sgravityonmatter. ElementsandAtoms
1.Anelementisthesimplesttypeofmatterhavinguniquechemicalandphysical properties.
2.Anatomisthesmallestparticleofanelementthathasthechemicalcharacteristicsof thatelement.Anelementiscomposedofonlyonekindofatom.
3.Atomsconsistofprotons,neutrons,andelectrons.
Protonsarepositivelycharged,electronsarenegativelycharged,andneutrons havenocharge.
Protonsandneutronsareinthenucleus;electronsarelocatedaroundthenucleus, andcanberepresentedbyanelectroncloud.
4.Theatomicnumberistheuniquenumberofprotonsinanatom.Themassnumberis thesumoftheprotonsandtheneutrons.
5.Isotopesareatomsthathavethesameatomicnumberbutdifferentmassnumbers.
6.Theatomicmassofanelementistheaveragemassofitsnaturallyoccurringisotopes weightedaccordingtotheirabundance.
7.AmoleofasubstancecontainsAvogadro’snumber(6.022x1023)ofatoms,ions,or molecules.Themolarmassofasubstanceisthemassof1moleofthesubstance expressedingrams.
1.Thechemicalbehaviorofatomsisdeterminedmainlybytheiroutermostelectrons.A chemicalbondoccurswhenatomsshareortransferelectrons.
2.Ionsareatomsthathavegainedorlostelectrons.
Anatomthatloses1ormoreelectronsbecomespositivelychargedandiscalleda cation.Ananionisanatomthatbecomesnegativelychargedafteraccepting1or moreelectrons.
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Anionicbondresultsfromtheattractionoftheoppositelychargedcationand aniontoeachother.
3.Acovalentbondformswhenelectronpairsaresharedbetweenatoms.Apolar covalentbondresultswhenthesharingofelectronsisunequalandcanproducea polarmoleculethatiselectricallyasymmetric.
1.Amoleculeistwoormoreatomschemicallycombinedtoformastructurethat behavesasanindependentunit.Acompoundistwoormoredifferenttypesofatoms chemicallycombined.
2.Thekindsandnumbersofatoms(orions)inamoleculeorcompoundcanbe representedbyaformulaconsistingofthesymbolsoftheatoms(orions)plus subscriptsdenotingthenumberofeachtypeofatom(orion).
3.Themolecularmassofamoleculeorcompoundcanbedeterminedbyaddingupthe atomicmassesofitsatoms(orions).
IntermolecularForces
1.Ahydrogenbondistheweakattractionbetweentheoppositelychargedregionsof polarmolecules.Hydrogenbondsareimportantindeterminingthethree-dimensional structureoflargemolecules.
2.Solubilityistheabilityofonesubstancetodissolveinanother.Ionicsubstancesthat dissolveinwaterbydissociationareelectrolytes.Moleculesthatdonotdissociateare nonelectrolytes.
2.2ChemicalReactionsandEnergy SynthesisReactions
1.Asynthesisreactionisthechemicalcombinationoftwoormoresubstancestoforma neworlargersubstance.
2.Adehydrationreactionisasynthesisreactioninwhichwaterisproduced.
3.Thesumofallthesynthesisreactionsinthebodyiscalledanabolism. DecompositionReactions
1.Adecompositionreactionisthechemicalbreakdownofalargersubstancetotwoor moredifferentandsmallersubstances.
2.Ahydrolysisreactionisadecompositionreactioninwhichwaterisdepleted.
3.Thesumofallthedecompositionreactionsinthebodyiscalledcatabolism. ReversibleReactions
Reversiblereactionsproduceanequilibriumconditioninwhichtheamountofreactants relativetotheamountofproductsremainsconstant.
Oxidation-ReductionReactions
Oxidation-reductionreactionsinvolvethecompleteorpartialtransferofelectrons betweenatoms.
Energy
1.Energyistheabilitytodowork.Potentialenergyisstoredenergy,andkineticenergy isenergyresultingfromthemovementofanobject.
2.Chemicalenergy
Chemicalbondsareaformofpotentialenergy.
Chemicalreactionsinwhichtheproductscontainmorepotentialenergythanthe reactantsrequiretheinputofenergy.
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Chemicalreactionsinwhichtheproductshavelesspotentialenergythanthe reactantsreleaseenergy.
3.Heatenergy
Heatenergyisenergythatflowsbetweenobjectsthatareatdifferent temperatures.
Heatenergyisreleasedinchemicalreactionsandisresponsibleforbody temperature.
1.Activationenergyistheminimumenergythatthereactantsmusthavetostarta chemicalreaction.
2.Enzymesarespecializedproteincatalyststhatlowertheactivationenergyfor chemicalreactions.Enzymesspeedupchemicalreactionsbutarenotconsumed oralteredintheprocess.
3.Increasedtemperatureandconcentrationofreactantscanincreasetherateof chemicalreactions.
Inorganicchemistryismostlyconcernedwithnon-carbon-containingsubstancesbutdoes includesomecarbon-containingsubstances,suchascarbondioxideandcarbonmonoxide thatlackcarbon-hydrogenbonds.Someinorganicchemicalsplayimportantrolesinthe body.
1.Waterisapolarmoleculecomposedofoneatomofoxygenandtwoatomsof hydrogen.
2.Becausewatermoleculesformhydrogenbondswitheachother,waterisgoodat stabilizingbodytemperature,protectingagainstfrictionandtrauma,makingchemical reactionspossible,directlyparticipatinginchemicalreactions(e.g.,dehydrationand hydrolysisreactions),andservingasamixingmedium(e.g.,solutions,suspensions, andcolloids).
3.Amixtureisacombinationoftwoormoresubstancesphysicallyblendedtogether, butnotchemicallycombined.
4.Asolutionisanyliquid,gas,orsolidinwhichthesubstancesareuniformly distributedwithnoclearboundarybetweenthesubstances.
5.Asolutedissolvesinthesolvent.
6.Asuspensionisamixturecontainingmaterialsthatseparatefromeachotherunless theyarecontinually,physicallyblendedtogether.
7.Acolloidisamixtureinwhichadispersed(solutelike)substanceisdistributed throughoutadispersing(solventlike)substance.Particlesdonotsettleoutofa colloid.
1.Onemeasurementofsolutionconcentrationistheosmole,whichcontains Avogadro’snumber(6.022x1023)ofparticles(i.e.,atoms,ions,ormolecules)in1 kilogramofwater.
2.Amilliosmoleis1/1000ofanosmole.
1.Acidsareproton(H+)donors,andbases(OH-)areprotonacceptors.
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2.Astrongacidorbasealmostcompletelydissociatesinwater.Aweakacidorbase partiallydissociates.
3.ThepHscaleshowstheH+concentrationsofvarioussolutions.
AneutralsolutionhasanequalnumberofH+andOH-andisassignedapHof7.
Acidicsolutions,inwhichthenumberofH+isgreaterthanthenumberofOH, havepHvalueslessthan7.
Basic,oralkaline,solutionshavemoreOH-thanH+andapHgreaterthan7.
4.AsaltisamoleculeconsistingofacationotherthanH+andananionotherthanOHSaltsformwhenacidsreactwithbases.
5.Abufferisasolutionofaconjugateacid-basepairthatresistschangesinpHwhen acidsorbasesareaddedtothesolution.
Oxygenisnecessaryforthereactionsthatextractenergyfromfoodmoleculesinliving organisms.Whentheorganicmoleculesarebrokendownduringmetabolism,carbon dioxideandenergyarereleased.
2.4OrganicChemistry
Organicmoleculescontaincarbonandhydrogenatomsboundtogetherbycovalentbonds.
1.Monosaccharidesarethebasicbuildingblocksofothercarbohydrates.Examplesare ribose,deoxyribose,glucose,fructose,andgalactose.Glucoseisanespecially importantsourceofenergy.
2.Disaccharidemoleculesareformedbydehydrationreactionsbetweentwo monosaccharides.Theyarebrokenapartintomonosaccharidesbyhydrolysis reactions.Examplesofdisaccharidesaresucrose,lactose,andmaltose.
3.Apolysaccharideiscomposedofmanymonosaccharidesboundtogethertoforma longchain.Examplesincludecellulose,starch,andglycogen.
1.Triglyceridesarecomposedofglycerolandfattyacids.One,two,orthreefattyacids canattachtotheglycerolmolecule.
Fattyacidsarestraightchainsofcarbonmoleculeswithacarboxylgroup.Fatty acidscanbesaturated(havingonlysinglecovalentbondsbetweencarbonatoms) orunsaturated(havingoneormoredoublecovalentbondsbetweencarbon atoms).
Energyisstoredinfats.
2.Phospholipidsarelipidsinwhichafattyacidisreplacedbyaphosphate-containing molecule.Phospholipidsareamajorstructuralcomponentofplasmamembranes.
3.Steroidsarelipidscomposedoffourinterconnectedringmolecules.Examplesare cholesterol,bilesalts,andsexhormones.
4.Otherlipidsincludefat-solublevitamins,prostaglandins,thromboxanes,and leukotrienes.
1.Thebuildingblocksofaproteinareaminoacids,whicharejoinedbypeptidebonds.
2.Thenumber,kind,andarrangementofaminoacidsdeterminetheprimarystructureof aprotein.Hydrogenbondsbetweenaminoacidsdeterminesecondarystructure,and hydrogenbondsbetweenaminoacidsandwaterdeterminetertiarystructure. Interactionsbetweendifferentproteinsubunitsdeterminequaternarystructure.
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3.Enzymesareproteincatalyststhatspeedupchemicalreactionsbyloweringtheir activationenergy.
4.Theactivesitesofenzymesbindonlytospecificreactants.
5.Cofactorsareionsororganicmolecules,suchasvitamins,thatarerequiredforsome enzymestofunction.
1.Thebasicunitofnucleicacidsisthenucleotide,whichisamonosaccharidewithan attachedphosphateandanorganicbase.
2.DNAnucleotidescontainthemonosaccharidedeoxyriboseandtheorganicbase adenine,thymine,guanine,orcytosine.DNAoccursasadoublestrandofjoined nucleotides.Eachstrandiscomplementaryandantiparalleltotheotherstrand.
3.AgeneisasequenceofDNAnucleotidesthatdeterminesthestructureofaproteinor RNA.
4.RNAnucleotidesarecomposedofthemonosaccharideribose.Theorganicbasesare thesameasforDNA,exceptthatthymineisreplacedwithuracil.
AdenosineTriphosphate
Adenosinetriphosphate(ATP)storesenergyderivedfromcatabolism.Theenergy releasedfromATPisusedinanabolismandothercellprocesses.
Manypeopleentertheirfirstcourseinanatomyandphysiologyenvisioningthebodyasasolid andsingularentitythathasteleologicalcontrolofitsinternalfunctions.Toincreasestudent understandingdevelopashortwrittenassignmentthatasksthemtointegratethevariouslevelsof organizationthatareintroducedhereandinChapter1.Here’sanexample:Chooseanybody partororgan,suchasthehandorheart.Nameallstructurallevelsofthechoiceincluding molecules,organelles,cells,tissues,organs,etc.
Introducetheproductionandusesofradioactiveisotopesduringthediscussionofatomic structure.UsetheClinicalImpact:ApplicationsofAtomicParticlesasareadingassignment andaskstudentstothinkaboutthepossibledamagetoothermacromolecules,suchasthecellular DNA,andtoweighthatriskagainstthepotentialtherapeuticbenefitsofradiationtherapy.
Manyclinicaltestshaveachemicalbasis.Forhomeworkhavestudentsresearchdiagnostictests andproceduresanddeterminethechemicalfoundationofeach.
Engineeringandbiologicalproblemsareassociatedwiththebioengineeringofsynthetic substancesthatreplacebodychemicalsortissues.Havetheclassdiscussthechemicaland biologicalconsiderationsofsuchnewtechnologiessuchas:Teflonhipreplacements,synthetic hormones,artificialheartvalves,andsyntheticblood.
EnzymeSpecificityandProteinFunctions
Althoughtherearemanyexamplesofstructuralandfunctionalrelationshipswithachemical
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basis,perhapstheexamplethatstudentscanmostreadilygraspisthelockandkeymodelof enzyme/substrateinteractions.Thismetaphoreasilyexpandstothenextlevelsof organization,whichareotherfunctionsofproteininthecellmembrane,cell,tissues,andthe body.Proteinshaveacomplexstructureandavarietyoffunctionsthatdependonspecific structuralparameters.Askstudents,“Howdoesthestructureofaproteinaffectitsfunction?” (Examples:collagen,insulin,hemoglobin)Changingthestructureofaproteinwillalterits functionalcapabilities.Thisthemerecursinthestudyofanatomyandphysiology.
FunctionsofOrganicMolecules
Thefollowingtablesareexcellentresourcesaboutthefunctionofthedifferentorganic moleculesinthebody:Table2.6,RoleofCarbohydratesintheBody,Table2.7,Roleof LipidsintheBody,andTable2.8,RoleofProteinsintheBody.
Homeostasis
ChemicalEquilibrium
Theconceptofchemicalequilibriumis,inessence,asimplerformofthedynamicequilibrium establishedandmaintainedbythebody.Helpstudentsexplorethesimilaritiesanddifferences betweenchemicalequilibriumandbiologicalhomeostasis.
Afterreadingthischapter,studentsshouldbeableto:
3.1AListthegeneralpartsofacell.
3.1BRelateandexplainthefourmainfunctionsofcells.
3.2ARelatethekindsofmicroscopesusedtostudycells.
3.3ADescribethefunctionsandgeneralstructureoftheplasmamembrane.
3.3BRelatewhyamembranepotentialisformed.
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3.4AListanddescribethefunctionsofmembranelipids.
3.4BExplainthenatureofthefluid-mosaicmodelofmembranestructure.
3.5AListandexplainthefunctionsofmembraneproteins.
3.5BDescribethecharacteristicsofspecificity,competition,andsaturationoftransport proteins.
3.6ADescribethenatureoftheplasmamembraneinreferencetopassageofmaterials throughit.
3.6BListandexplainthethreewaysthatmoleculesandionscanpassthroughtheplasma membrane.
3.6CDiscusstheprocessofdiffusionandrelateittoaconcentrationgradient.
3.6DExplaintheroleofosmosisandosmoticpressureincontrollingthemovementofwater acrosstheplasmamembrane.Illustratethedifferencesamonghypotonic,isotonic,and hypertonicsolutionsintermsofwatermovement.
3.6EDescribemediatedtransport.
3.6FCompareandcontrastfacilitateddiffusion,activetransport,andsecondaryactive transport.
3.6GDescribetheprocessesofendocytosisandexocytosis.
3.7ADescribethecompositionandfunctionsofthecytoplasm.
3.7BDescribethecompositionandfunctionofthecytoskeleton.
3.8ADefineorganelle.
3.8BDescribethestructureandfunctionofthenucleusandnucleoli.
3.8CExplainthestructureandfunctionofribosomes.
3.8DComparethestructureandfunctionsofroughandsmoothendoplasmicreticula.
3.8EDiscussthestructureandfunctionoftheGolgiapparatus.
3.8FDescribetheroleofsecretoryvesiclesinthecell.
3.8GComparethestructureandrolesoflysosomesandperoxisomesindigestingmaterial withinthecell.
3.8HRelatethestructureandfunctionofproteosomes.
3.8IDescribethestructureandfunctionofmitochondria.
3.8JExplainthestructureandfunctionofthecentrosome.
3.8KComparethestructureandfunctionofcilia,flagella,andmicrovilli.
3.9ADescribethetwo-stepprocessthatresultsingeneexpression.
3.9BExplaintherolesofDNA,mRNA,tRNA,andrRNAintheproductionofaprotein.
3.9CExplainwhatthegeneticcodeisandwhatitiscodingfor.
3.9DDescribewhatoccursduringposttranscriptionalprocessingandposttranslational processing.
3.9EDescribetheregulationofgeneexpression.
3.10ADescribethestagesofthecelllifecycle.
3.10BGivethedetailsofDNAreplication.
3.10CExplainwhatoccursduringmitosisandcytokinesis.
3.10DDefineapoptosis.
3.11AListthemajorhypothesesofaging.
ChapterOutline
3.1FunctionsoftheCell
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1.Theplasmamembraneformstheouterboundaryofthecell.
2.Thenucleusdirectsthecell’sactivities.
3.Thecytoplasm,betweenthenucleusandtheplasmamembrane,iswheremostcell activitiestakeplace.
4.Cellsperformthefollowingfunctions:
Cellsmetabolizeandreleaseenergy.
Cellssynthesizemolecules.
Cellsprovideameansofcommunication.
Cellsreproduceandprovideforinheritance.
3.2HowWeSeeCells
1.Lightmicroscopesallowustovisualizethegeneralfeaturesofcells.
2.Electronmicroscopesallowustovisualizethefinestructureofcells.
3.3PlasmaMembrane
1.Theplasmamembranepassivelyoractivelyregulateswhatentersorleavesthecell.
2.Theplasmamembraneiscomposedofaphospholipidbilayer,inwhichproteinsare suspended(commonlydepictedbythefluid-mosaicmodel).
3.4MembraneLipids
Lipidsgivetheplasmamembranemostofitsstructureandsomeofitsfunction.
3.5MembraneProteins
1.Membraneproteinsfunctionasmarkermolecules,attachmentproteins,transportproteins, receptorproteins,andenzymes.
2.Transportproteinsincludechannelproteins,carrierproteins,andATP-poweredpumps.
3.Somereceptorproteinsarelinkedtoandcontrolchannelproteins.
4.SomereceptormoleculesarelinkedtoGproteincomplexes,whichcontrolnumerous cellularactivities.
3.6MovementThroughthePlasmaMembrane
1.Lipid-solublemoleculespassthroughtheplasmamembranereadilybydissolvinginthe lipidbilayer.Smallmoleculesdiffusebetweenthephospholipidmoleculesoftheplasma membrane.
2.Largenon-lipid-solublemoleculesandions(e.g.,glucoseandaminoacids)are transportedthroughthemembranebytransportproteins.
3.Large,non-lipid-solublemolecules,aswellasverylargemoleculesandevenwholecells, canbetransportedacrossthemembraneinvesicles.
PassiveMembraneTransport
1.Diffusionisthemovementofasubstancefromanareaofhighersoluteconcentration tooneoflowersoluteconcentration(downaconcentrationgradient).
2.Theconcentrationgradientisthedifferenceinsoluteconcentrationbetweentwo pointsdividedbythedistanceseparatingthepoints.
3.Therateofdiffusionincreaseswithanincreaseintheconcentrationgradient,an increaseintemperature,adecreaseinmolecularsize,andadecreaseinviscosity.
4.Theendresultofdiffusionisuniformdistributionofmolecules.
5.Diffusionrequiresnoexpenditureofenergy.
6.Osmosisisthediffusionofwater(solvent)acrossaselectivelypermeablemembrane.
7.Osmoticpressureistheforcerequiredtopreventthemovementofwateracrossa selectivelypermeablemembrane.
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8.Isosmoticsolutionshavethesameconcentrationofsoluteparticles,hyperosmotic solutionshaveagreaterconcentrationofsoluteparticles,andhyposmoticsolutions havealesserconcentrationofsoluteparticles.
9.Cellsplacedinanisotonicsolutionneitherswellnorshrink.Inahypertonicsolution, theyshrink(crenate);inahypotonicsolution,theyswellandmayburst(lyse).
10.Mediatedtransportisthemovementofasubstanceacrossamembranebymeansofa transportprotein.Thesubstancestransportedtendtobelarge,water-soluble molecules.
11.Facilitateddiffusionmovessubstancesdowntheirconcentrationgradientanddoes notrequireenergy(ATP).
1.Activetransportcanmovesubstancesagainsttheirconcentrationgradientand requiresATP.Anexchangepumpisanactivetransportmechanismthat simultaneouslymovestwosubstancesinoppositedirectionsacrosstheplasma membrane.
2.Insecondaryactivetransport,anionismovedacrosstheplasmamembranebyactive transport,andtheenergyproducedbytheiondiffusingbackdownitsconcentration gradientcantransportanothermolecule,suchasglucose,againstitsconcentration gradient.
3.Vesiculartransportisthemovementoflargevolumesorreleaseofsubstancesacross theplasmamembranethroughtheformationorreleaseofavesicle.
4.Endocytosisisthebulkmovementofmaterialsintocells.
Phagocytosisisthebulkmovementofsolidmaterialintocellsbytheformationof avesicle.
Pinocytosisissimilartophagocytosis,exceptthattheingestedmaterialismuch smallerandisinsolution.
5.Receptor-mediatedendocytosisallowsforendocytosisofspecificmolecules.
6.Exocytosisisthesecretionofmaterialsfromcellsbyvesicleformation.
7.Endocytosisandexocytosisbothrequireenergy.
3.7Cytoplasm
Thecytoplasmisthematerialoutsidethenucleusandinsidetheplasmamembrane. Cytosol
1.Cytosolconsistsofafluidpart(thesiteofchemicalreactions),thecytoskeleton,and cytoplasmicinclusions.
2.Thecytoskeletonsupportsthecellandisresponsibleforcellmovements.Itconsists ofproteinfibers.
Microtubulesarehollowtubescomposedoftheproteintubulin.Theyform spindlefibersandarecomponentsofcentrioles,cilia,andflagella.
Actinfilamentsaresmallproteinfibrilsthatprovidestructuretothecytoplasmor causecellmovements.
Intermediatefilamentsareproteinfibersthatprovidestructuralstrengthtocells.
3.Membranesdonotsurroundcytoplasmicinclusions,suchaslipochromes.
3.8TheNucleusandCytoplasmicOrganelles
Organellesaresubcellularstructuresspecializedforspecificfunctions.
TheNucleus
1.Thenuclearenvelopeconsistsofadoublemembranewithnuclearpores.
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2.DNAandassociatedproteinsarefoundinsidethenucleusaschromatin.
3.DNAisthehereditarymaterialofthecell.Itcontrolscellactivitiesbyproducing proteinsthroughRNA.
4.AgeneisaportionofaDNAmolecule.Genesdeterminetheproteinsinacell.
5.NucleoliconsistofRNAandproteinsandarethesitesofribosomalsubunitassembly.
Ribosomes
1.Ribosomesconsistofsmallandlargesubunitsmanufacturedinthenucleolusand assembledinthecytoplasm.
2.Ribosomesarethesitesofproteinsynthesis.
3.Ribosomescanbefreeorassociatedwiththeendoplasmicreticulum.
1.Theendoplasmicreticulumisanextensionoftheoutermembraneofthenuclear envelope;itformstubulesorsacs(cisternae)throughoutthecell.
2.Theroughendoplasmicreticulumhasribosomesandisasiteofproteinsynthesisand modification.
3.Thesmoothendoplasmicreticulumlacksribosomesandisinvolvedinlipid production,detoxification,andcalciumstorage.
GolgiApparatus
TheGolgiapparatusisaseriesofcloselypacked,modifiedcisternaethatmodify, package,anddistributelipidsandproteinsproducedbytheendoplasmicreticulum.
SecretoryVesicles
Secretoryvesiclesaremembrane-boundsacsthatcarrysubstancesfromtheGolgi apparatustotheplasmamembrane,wherethecontentsofthevesiclesarereleasedby exocytosis.
Lysosomes
1.Lysosomesaremembrane-boundsacscontaininghydrolyticenzymes.Withinthe cell,theenzymesbreakdownphagocytizedmaterialandnonfunctionalorganelles (autophagy).
2.Enzymesreleasedfromthecellbylysisorenzymessecretedfromthecellcandigest extracellularmaterial.
Peroxisomes
Peroxisomesaremembrane-boundsacscontainingenzymesthatdigestfattyacidsand aminoacids,aswellasenzymesthatcatalyzethebreakdownofhydrogenperoxide.
Proteasomes
Proteasomesarelarge,multienzymecomplexes,notboundbymembranesthatdigest selectedproteinswithinthecell.
Mitochondria
1.MitochondriaarethemajorsitesfortheproductionofATP,whichcellsuseasan energysource.
2.Themitochondriahaveasmoothoutermembraneandaninnermembranethatis infoldedtoformcristae.
3.MitochondriacontaintheirownDNA,canproducesomeoftheirownproteins,and canreplicateindependentlyofthecell.
1.Centriolesarecylindricalorganelleslocatedinthecentrosome,aspecializedzoneof thecytoplasmthatservesasthesiteofmicrotubuleformation.
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