the cardiac cycle

Question 1

1. late diastole

Answer 1

both sets of chambers are relaxed and ventricles fill pasively

Question 2

2. atrial systole

Answer 2

atrial contraction forces a small amount of blood into ventricles

Question 3

3. isovolumic ventricular contraction

Answer 3

first phase of ventricular contraction pushes AV valves closed
doesn’t create enough pressure to open semilunar valves

Question 4

4. ventricular ejection

Answer 4

as ventricular pressure rises and exceeds pressure in arteries, the semilunar valves open and blood is ejected

Question 5

5. isovolumic ventricular relaxation

Answer 5

as ventricles relax, pressure in ventricles fall. blood flows back into cusps of semilunar valves and snaps them closed

Question 6

ejection fraction

Answer 6

stroke volume/EDV

Question 7

stroke volume

Answer 7

EDV - ESV

Question 8

a wave

Answer 8

atrial contraction

Question 9

c wave

Answer 9

rapid increase in pressure (ventricular contraction causing mitral valve to shut which stops when aortic valve opens)

Question 10

v wave

Answer 10

blood flows back into atrium and mitral valve shut to pressure gradually increases until valve opens