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Flashcards in Unit 2 Deck (194)
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1

Arteries have:
______ pressure
_______ velocity of blood flow
_______ walled
Lots of ______, _____ and _____ muscle
Functions as a ______ (resistance to flow doesnt change much

High pressure
High velocity of blood flow
Thick walled
Lots of elastin, collagen and smooth msucle
Functions as a conduit

2

_______ control flow into capillaries and are the MOST important determinant of PERIPHERAL RESISTANCE

Arterioles

3

What is the most important determinant of peripheral resistance?

Arterioles

4

Arterioles contains much ____ muscle and can change ______

Smooth muscle
DIAMETER

5

_____ function to exchange fluid, nutrients, electrolytes, hormones, etc to tissue cells.

Thin walled and no muscle

Capillaries

6

Veins and venules have _____ pressure
Thin walls that are ________

Low; distensible

7

The total cords-sectional area is the sum of the individual ______ area of each ______ category

Cross sectional
Blood vessel

8

Even though capillaries have the ______ diameter individually, they have the _______ cross-sectional area

Smallest; largest combined

9

Most of the blood volume is in the _______ system

Venous

10

Veins and venules are considered to be the _________

Blood reservoir

11

As total cross-sectional area increases, blood flow velocity _______

Decreases

(V=Q/A or V= F/A)

12

What is total cross sectional area?

The sum of the individual cross sectional areas of each blood vessel category

13

Capillaries have the smallest ______ individually and the largest combined

Diameter; cross sectional area

14

Blood flow (_or _) is the same or different? For each section of the circulation

Q or F; is the same for each section of circulation

15

Pressure in arteries is ____
Pressure in the capillaries averages about _____ mmHg
Pressure in venous system is ____

High; 17; low

16

What is Ohm’s law?

I=V/R

**algebraic rearrangement of this equation also hold true:
Delta P= QxR
R= delta P/Q

17

Blood flow (Q)= (P1-P2)/R is what equation?

Basic flow equation
AKA ohm’s law

18

Blood flow (Q) means what?

The volume of blood that passes a given point per unit of time

Ex: Liters per min

19

Cardiac output (CO) is what? And that is the typical caridac output

Q for the entire systemic circulation and typically is about 5 L/min

20

Explain laminar flow

Flow in layers
Parabolic shape of velocities
Generally quiet

21

Explain turbulent flow

Layers are disrupted by some partial obstruction or excessive velocity
Noisy

22

What is a carotid bruit?

Atherosclerotic plaques partially occluded an artery causing turbulent flow

23

When measuring blood pressure, cuff pressure should be ________ when inflated. One slowly let air out of cuff, between 80 and 120, will revive b

When the cuff is inflated so that it sto[s arterial blood flow. No sound can be heard through a stethoscope placed over the brachial artery distal to the cuff

Korotkoff sounds are created by pulsatilla blood flow through the compressed artery

Blood flow is silent when the artery is no longer compressed

24

What can be used to determine turbulent flow?

Reynold’s number

25

When Reynolds number rises above ______, turbulence is likely

200- 400

26

Turbulence often occurs in the _______ due to pulse and changes in vessel diameter during ejection

Aorta

27

T/F: Turbulence normally occurs in smaller vessels

F: turbulence normally doesn’t occur in smaller vessels

28

What is used to relate radius, viscosity and length to blood flow?

Poiseuilles law

Q= delta P x pie x r^4 / 8 n l

29

The total resistance of vessels in series is equal to the ________

Sum of their individual resistances

Rtotal= R1+R2+R3

30

For blood vessels arranged in parallel, more vessels means ______________

More avenues for blood flow and reduces resistance

1/Rtotal= 1/R1 + 1/R2