human-circulation-copy

THE BEAT GOES ON AND ON AND ON AND….

CIRCULATION and EXCHANGE OF NUTRIENTS AND WASTES WITHIN THE BODY AND THE ENVIRONMENT

Open vs. Closed Circulatory Systems

Circulation using water as the medium

Platyhelminthes

Open Circulatory System Arthropod

Closed Circulatory System with comparisons of arteries, veins, capillaries

d. vein

Compare the thickness of arteries vs. veins.

The Heart as Muscular Pump

BLOOD FLOW THROUGH THE HEART -1

SUPERIOR VENA CAVA

LUNGS

INFERIOR VENA CAVA

RA

RV

PULMONARY ARTERY

LUNGS PULMONARY ARTERY

LA

LV

BLOOD FLOW THROUGH THE HEART -2

SUPERIOR VENA CAVA

PULMONARY VEIN

INFERIOR VENA CAVA

PULMONARY VEIN

RA

LA

RV

PULMONARY ARTERY

LUNGS PULMONARY ARTERY

LV CORONARY ARTERY ARMS

DESCENDING AORTA CAROTID ARTERIES

Electrically-conductive structures of the heart and the initiation of the blood pressure

Pressure from the Heart – Systolic and Diastolic

Blood Pressure and Blood Flow

WHERE THE REAL WORK OF THE CIRCULATORY SYSTEM GETS DONE – THE CAPILLARY BEDS

What is hydrostatic pressure?

THIS IS REALLY WATER PRESSURE = BLOOD PRESSURE

What is osmotic pressure?

THIS IS THE PRESSURE TO PULL WATER INTO A BLOOD VESSEL. ALONG WITH THE WATER COMES NUTRIENTS.

AT ARTERIAL END Hydrostatic Pressure = 40mmHg Osmotic Pressure = 25 mmHg Net Pressure = 15 mmHg OUTWARD FLOW INTO CELLS

AT VENULE END Hydrostatic Pressure = 15 mm Hg Osmotic Pressure = 25 mm Hg Net Pressure = 10 MM Hg INWARD FLOW INTO CAPILLARIES

Pressure eventually reaches equilibrium, and actually a little too much fluid is forced out. So, the veins are able to reabsorb some of the lost fluid. While absorbing this fluid, other chemicals also enter the blood (like CO2 and other wastes).

Arterial blood has a higher pressure than the fluid surrounding the capillaries, so fluid is forced OUT as an attempt to balance pressures. (think osmosis!) Nutrients and oxygen are forced out of the blood along with the water.

Blood vessels distribute blood from the heart to all of the body’s tissues.