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.