Circulation Part 1 Flashcards Preview

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Flashcards in Circulation Part 1 Deck (49)
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1

What is the main function of systemic circulation?

deliver O2 and remove CO2 and wastes

2

What part of circulation is designed to carry blood under high pressure out to the tissue beds?

systemic arteries

3

What parts of circulation act as control valves to regulate blood flow?

arterioles and pre capillary sphincters

4

How thick are capillaries?

1 cell layer thick

5

Where does exchange occur between tissue and blood?

capillaries

6

What do venules do?

collect blood from capillaries

7

What structures return blood to heart/dynamic storage?

systemic veins

8

T/F: blood flow is proportional to metabolic demand.

True

9

T/F; cardiac output is controlled by local tissue flow.

true

10

T/F: Arterial pressure control is dependent on local flow or cardiac output.

False; arterial pressure is independent of local flow or cardiac output.

11

how many layers of endothelium exist in blood vessels?

1

12

What are the components of blood vessels?

endothelium, elastic tissue, smooth muscle, and fibrous tissue

13

What vessel is composed moreso of smooth muscle, aorta or typical arteries?

typical arteries

14

What vessel is composed more so of elastic tissue, aorta or typical arteries?

aorta

15

What vesel is composed more so of fibrous tissue, aorta or typical arteries?

aorta, but its still more elastic tissue than fibrous.

16

T/F: veins are pretty much equally composed of elastic fibers, smooth muscle, and fibrous tissue.

True

17

What are capillaries composed of?

only endothelium

18

What is Ohm's Law?

-V=IR (analogous to deltaP=FR)

19

Flow, Pressure gradient, resistance and Ohm's Law are all components of what?

Hemodynamics

20

What is the term for the volume of blood that passes a certain point per unit time (eg. ml/min)?

Flow (F)

21

T/F: At a given flow, the velocity is inversely proportional to the total cross sectional area.

True F=velocityX

22

T/F: Flow is inversely proportional to the change in Pressure and directly proportional to resistance.

False; vice-versa: F=deltaP/R

23

The driving force of blood and the difference in pressure between two points, are both ways to define what?

Pressure gradient

24

T/F: Pressure gradient is proportional to flow.

True

25

What happens to resistance of flow when the pressure drops?

the resistance increases equally

26

What kind of circuit is systemic circulation (predominately)?

parallel circuit

27

What is usually solved for indirectly by measuring flow and deltaP?

Resistance

28

What is TPR?

Total peripheral resistance

29

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

30

What is the term for internal friction of a fluid associated with the intermolecular attraction?

viscosity