Cardiovascular system

Question 1

CO=

Answer 1

HRxSV

Question 2

MAP=

Answer 2

DP + 1/3 PP

Question 3

PP=

Answer 3

SP - DP

Question 4

Requirements for effective cardiac function

Answer 4

No arrhythmia
No stenosis of valves
No insufficiency of valves
Muscle contractions must be forceful
Ventricles must fill adequately during diastole

Question 5

Cardiac output

Answer 5

quantity of blood per unit time pumped into the aorta by the heart
also equals the quantity of blood per unit time the flows through the circulation

Question 6

Stroke volume

Answer 6

amount of blood ejected out of each ventricle

Question 7

Major determinants of stroke volume

Answer 7

Ventricular preload- length of muscle at onset of contraction
Ventricular afterload- tension of muscle during contraction
myocardial contractility

Question 8

Variation in SV

Answer 8

due to cardiac filling during diastole

SV increases as EDV increases

Question 9

Starlings law

Answer 9

Larger the ventricular EDV— the larger the stroke volume

Question 10

MAP

Answer 10

average pressure over the entire cardiac cycle

Question 11

Dichrotic notch

Answer 11

small dip caused by the backfilling of the aortic valve as it closes

Question 12

Largest drop in MAP occurs where

Answer 12

across the arteriolar segment

-sight of highest vascular resistance

Question 13

Short-term control of MAP

Answer 13

altering CO and TPR

Question 14

Long-term control of MAP

Answer 14

altering blood volume via kidneys