Flashcards in Circulation Part 1 Deck (49)
What is the main function of systemic circulation?
deliver O2 and remove CO2 and wastes
What part of circulation is designed to carry blood under high pressure out to the tissue beds?
What parts of circulation act as control valves to regulate blood flow?
arterioles and pre capillary sphincters
How thick are capillaries?
1 cell layer thick
Where does exchange occur between tissue and blood?
What do venules do?
collect blood from capillaries
What structures return blood to heart/dynamic storage?
T/F: blood flow is proportional to metabolic demand.
T/F; cardiac output is controlled by local tissue flow.
T/F: Arterial pressure control is dependent on local flow or cardiac output.
False; arterial pressure is independent of local flow or cardiac output.
how many layers of endothelium exist in blood vessels?
What are the components of blood vessels?
endothelium, elastic tissue, smooth muscle, and fibrous tissue
What vessel is composed moreso of smooth muscle, aorta or typical arteries?
What vessel is composed more so of elastic tissue, aorta or typical arteries?
What vesel is composed more so of fibrous tissue, aorta or typical arteries?
aorta, but its still more elastic tissue than fibrous.
T/F: veins are pretty much equally composed of elastic fibers, smooth muscle, and fibrous tissue.
What are capillaries composed of?
What is Ohm's Law?
-V=IR (analogous to deltaP=FR)
Flow, Pressure gradient, resistance and Ohm's Law are all components of what?
What is the term for the volume of blood that passes a certain point per unit time (eg. ml/min)?
T/F: At a given flow, the velocity is inversely proportional to the total cross sectional area.
T/F: Flow is inversely proportional to the change in Pressure and directly proportional to resistance.
False; vice-versa: F=deltaP/R
The driving force of blood and the difference in pressure between two points, are both ways to define what?
T/F: Pressure gradient is proportional to flow.
What happens to resistance of flow when the pressure drops?
the resistance increases equally
What kind of circuit is systemic circulation (predominately)?
What is usually solved for indirectly by measuring flow and deltaP?
What is TPR?
Total peripheral resistance
What are the 3 advantages of systemic circulation being predominately parallel circuitry?
Independence of local flow control, minimizes TPR, and O2 rich blood supply to every tissue