Medical Examiner 2-21-20

Page 1

MEDICALEXAMINER

TM

HEALTH • MEDICINE • WELLNESS • HEALTH • MEDICINE • WELLNESS • HEALTH • MEDICINE • WELLNESS • HEALTH • MEDICINE • WELLNESS • HEALTH • MEDICINE • WELLNESS • HEALTH • MEDICINE • WELLNESS • HEALTH • MEDICINE • WELLNESS • HEALTH • MEDICINE • WELLNESS • HEALTH • MEDICINE • WELLNESS

FEBRUARY 21, 2020

AIKEN-AUGUSTA’S MOST SALUBRIOUS NEWSPAPER • FOUNDED IN 2006

AUGUSTARX.COM

BODY PARTS: THE OCCASIONAL SERIES

T

BLOOD

he heart gets a lot of attention every February. Nine years after he suffered a heart attack, President Lyndon Johnson proclaimed the first American Heart Month in February 1964. Well done, sir. The heart deserves all the credit we could possibly give it and then some. But with all due respect for the heart — we’d promptly die without it — the heart would be nothing without blood.   Yes, even though the heart is constantly bathed in blood as it pumps about 1,700 gallons of the stuff a day, it gets no nourishment or benefit from any of that blood. A tanker hauling 10,000 gallons of gasoline down the highway could run out of gas because its engine doesn’t run on gas from its massive tank. In the same way, the heart has to get its sustenance just like any other body part, in the heart’s case, through the aptly labeled coronary arteries.   Blood is amazing stuff, and it is everywhere. Cut or even merely prick your skin anywhere on the body and a drop of blood (or more) from the average CSRA adult’s 5-quart supply will appear instantly. We say CSRA because people who live up in high mountains can have up to two extra quarts in circulation. The extra blood can help capture and deliver more oxygen in high altitudes where there is less of it to go around. A low-altitude newborn, by comparison, has only about a cup of blood.   Most of us have learned that blood has four components: red blood cells, white blood cells, platelets, and plasma. True. But then, what is hemoglobin? What are corpuscles? What about lymphocytes, erythrocytes and leukocytes?   Like everything else in the natural world, the closer blood is examined, the more complex and sophisticated it is discovered to be. According to one source, a single drop of blood can contain four thousand different types of molecules, which is slightly greater than four.   So let’s take a quick look at the four major components and see how many of the additional four thousand we can work into this article. [Spoiler alert: we’re

not going to even come close.] Plasma   Plasma is the liquid part of blood, the vehicle in which the other elements swim. It’s mostly water, which is a lot like saying blood has four components. Plasma also contains vital proteins like albumin, globulin and fibrinogen, each with key assignments. Albumin keeps plasma in blood vessels; a deficiency can lead to edema as plasma leaks into surrounding tissues. Fibrinogen aids in clotting, and globulin proteins help fight infections, particularly gamma globulin. (There are also alpha and beta globulins; the differences come from their varying reactions to electric fields in the body.)   Plasma is also the body’s hormone delivery system, and in addition helps convey both waste materials away from and nutrients to their proper destinations among our roughly 37.2 trillion cells. Red blood cells   That word erythrocyte (uh-RITH-ruh-site) from before? That’s a synonym for red blood cell. They are the most common cells circulating in plasma, numbering around 4 to 6 million in each microliter of blood (a microliter is 0.00003 of an ounce), and they are tiny. Remember the old cigarette ads for a brand that said it was “a silly millimeter longer”? That may not have been much, but for comparison’s sake, a red blood cell (RBC) measures about 7 microns in diameter, and a micron is 1/1,000 of a millimeter. To put it another way, that’s 0.0000039 inches. More about size in just a moment.   Red blood cells are what we commonly think of when we picture blood. The cells in the image above are RBCs, showing their famous round pillow shape. They are unusual in that, unlike most cells, they don’t have a nucleus. Please see BLOOD page 3


Turn static files into dynamic content formats.

Create a flipbook
Issuu converts static files into: digital portfolios, online yearbooks, online catalogs, digital photo albums and more. Sign up and create your flipbook.