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Flashcards in Exam 2 Deck (166)
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1

What circulatory structures acts as a control valve to regulate flow?

Arterioles and pre capillary sphincters

2

T/F: Pulmonary blood flow=venous return=cardiac output

True

3

What 4 histologic materials are vessels made of?

Endothelium
Elastic tissue
Smooth muscle
Fibrous tissue

4

What tissue is most prominant in the aorta?

Elastic, (then fibrous, then smooth muscle)

5

In a typical artery, what tissue type dominates?

Smooth muscle (then elastic, then fibrous)

6

What structure is only made of endothelium?

Capillaries

7

The volume of blood that passes a certain point per unit time is what?

Flow rate

8

At a given flow, the velocity is ________ to the cross-sectional area of a vessel.

Inversely proportional

9

What is the only organ to have flow in excess to the cardiac output (CO)?

Lungs

10

Flow is ___ to change in pressure but ____ to resistance.

Proportional to chg P, but inversely proportional to resistance

11

What is considered the driving force of blood movement.?

Pressure gradient

12

Systemic circulation is predominantly a ____circuit? Series, parallel, or series¶llel?

Parallel

13

3 advantages of a parallel circuitry?

1. Incr/decr flow to tissues independently
2. Lowers total peripheral resistance (TPR)
3. Oxygen rich blood to every tissue

14

Slower blood flow is associated with an increase or decrease in blood viscosity?

Increase

15

What increases the flexibility of RBC's?

Fibrinogen

16

What is the normal range for hematocrit?

38%-45%

17

What disorder is associated with less than 38% hematocrit?

Anemia

18

T/F: Both EPO and exercise stimulate RBC production

True

19

What part of a vessel has the fastest velocity?

The center of the vessel

20

What is the normal, silent, and efficient type of flow called?

Laminar flow

21

How does Turbulent flow differ from Laminar flow?

Turbulent is less efficient, creates vibrational noise, and is associated with vessel dz

22

What location in the circulatory system is most likely to have turbulent flow?

Aorta

23

If the Reynold's # (R#) is less than 2000 flow is ____, and if the R# is greater than 3000 flow is ___.

3000=turbulent

24

What is the only factor that is inversely proportional to Reynold's #: velocity, viscosity, diameter, density

Viscosity, (all others are proportional)

25

T/F: Broad band Doppler reading is associated with laminar flow

False: Broad=turbulent...Narrow=laminar

26

T/F: Fick principal is associated with determination of cardiac output

True

27

What is distensibility?

the ability of a vessel to stretch

28

How is compliance different from distensibility?

Compliance is the ability of a vessel to stretch AND hold volume

29

Which is more compliant: arteries or veins?

Veins...arteries can't store much blood

30

T/F: In systemic arteries, a small change in volume is associated with a small change in pressure?

False: small change in volume-->large change in pressure