2. CV Function Flashcards Preview

EXB 112 > 2. CV Function > Flashcards

Flashcards in 2. CV Function Deck (25):
1

What happens to the blood that is leftover from net filtration and reabsorption?

Goes to the lymph system

2

How does plasma volume shift w/ weight training?

Plasma volume drops by 20% at onset of lifting, then fluid moves back into circulatory system after about an hour

3

Equation for blood flow to an organ

Q(organ) = ΔP/R(organ)
-ΔP = pressure driving it in vs. pressure at the end of the organ
-R(organ) = summed resistance of all vasculature

4

Flow rate in a parallel resistance network

Can tailor flow to specific tissues and organs b/c of different resistances

5

Flow rate in a series resistance network

-Flow rate is dictated by highest resistance (narrowest tubes)
-Pressure diminishes further down series --> organs later in series unhappy b/c less pressure = less flow to organ

6

What is total peripheral resistance?

Summed resistance to forward flow in systemic circulation

7

Equation for MAP

MAP = 2/3 DBP + 1/3 SBP

8

What is the highest blood pressure heard? Lowest?

-Highest = systolic
-Lowest = diastolic

9

Equation for cardiac output of the CV system

Qsystem = MAP/TPR
-MAP = ΔP(a-v)

10

What causes cardiogenic shock?

Myocardial failure

11

What causes hypovolemic shock?

Fluid loss

12

What causes anaphylactic/septic shock?

Vasodilator release

13

What causes neurogenic shock?

Decrease in sympathetic nerve activity

14

Is there a diff in flow rate though the left vs. right sides of the heart?

No, they are equal

15

What is the relative pressure and resistance in systemic circulation?

-High pressure (avg ~100 mmHg)
-High resistance to flow

16

What is the relative pressure and resistance in pulmonary circulation?

-Low pressure (avg ~20 mmHg)
-Low resistance to flow

17

What is the driving force for blood flow?

Pressure gradient created by the heart

18

What primarily regulates the blood flow to each organ?

Resistance properties of its arterioles

19

What is the primary cause of cardiac output?

Venous return

20

What are the physiological determinants of cardiac output?

Stroke volume and heart rate

21

What determines heart rate?

Depolarization properties of the pacemaker cells

22

What factors affect preload?

Frank-Starling law, venous return

23

What determines afterload?

Arterial pressure

24

On a pressure-volume loop, what denotes preload?

End-diastolic volume

25

On a pressure-volume loop, what denotes afterload?

Aortic diastolic pressure