CV Regulation and CO

Question 1

What are the cardiac baroreceptors and what CN do they go with?

Answer 1

Carotid sinus IX
Aortic Arch X

Question 2

Understand this chart don’t memorize.

Answer 2

Understand Chart

Question 3

What does IPP, MABP, CVP, and Psf stand for in this diagram?

Answer 3

IPP: intrapleural pressure
LH: left heart
MABP: mean arterial blood pressure
Psf: mean systemic filling pressure

Question 4

What are 4 determinants of cardiac output?

Answer 4

heart rate
contractility
afterload
preload (determined by VR)

Question 5

How is there compensation for VR when a person has endogenously mediated tachycardia. (Excercise induced)

Answer 5

sympathetic stimulation to the heart increases contractility which helps maintain stroke volume and decreases systolic interval this preserving diastolic filling

sympathetic stim increases conduction velocity in the heart

sympathetic stim venoconstricts which helps preserve VR

Sk muscle pump increases VR helping to maintain ventricular filling

Question 6

Formula for Psf?

Answer 6

Psf = V/C

Question 7

Formula for VR?

Answer 7

VR = Psf-RAP / R

Question 8

Compliance formula?

Answer 8

C = ΔV/ΔP

Question 9

Label points A and B.

Answer 9

A = steady-state cardiac output

B = mean systemic filling pressure (Psf)

Question 10

Describe what is happening in A, B, C, D on the graph.

Answer 10

A: arteriolor dilation
B: arteriolar constriction
C: increased vascular volume; decreased venous compliance
D: decreased vascular volume increased venous compliance

Question 11

What is the formula for TPR?

Answer 11

TPR = MAP - RAP/CO

Question 12

Formula for MAP?

There are 3 of them.

Answer 12

MAP = CO x TPR
MAP = diastolic + 1/3 PP
MAP = 2/3 DP + 1/3 systolic pressure