Cardiac Cycle

Question 1

What occurs during isovolumetric contraction?

Answer 1

There is no change in volume due to closure of AV valve and closure of Aortic valve. Enough pressure builds up from blood in ventricles causing opening of Aortic Valve.

Question 2

What occurs during isovolumetric relaxation?

Answer 2

There is a relaxation of the ventricles due to closure of A valve and prior to opening of AV Valve.

Question 3

What is the period of systole?

Answer 3

It is the contraction phase or ejection of volume from the closure of AV Valve to opening of AV Valve.

Question 4

What is the period of diastole?

Answer 4

Starts from rapid filling, flowing into ventricle, atria contracts giving final 20% of blood.

Question 5

What explains the small increase in pressure prior to isovolumetric contraction?

Answer 5

Atrial contraction

Question 6

What is the pressure in the left and right ventricle during rapid ejection, respectively?

Answer 6

80mmHg, 8mmHg

Question 7

How much blood is ejected during rapid ejection and slow ejection, respectively?

Answer 7

70%, 30%

Question 8

How to calculate stroke volume?

Answer 8

Systole-diastole (avg. 70 ml)

Question 9

How to calculate Ejection Fraction?

Answer 9

Stroke Vol / End Diastolic Vol.

Question 10

Increase stroke volume output by increasing ___ and decreasing __.

Answer 10

1) EDV

2) ESV

Question 11

What is average EDV?

Answer 11

110-120

Question 12

What is average ESV?

Answer 12

40-50