The cardiac cycle

Question 1

first heart sound

Answer 1

my trial,tricuspid or atrioventricular valves shut

Question 2

second heart sound

Answer 2

aortic and pulmonary valves shut

Question 3

cardiac output

Answer 3

stroke volume x heart rate
this helps feed mucsles with oxygen

Question 4

pre-load

Answer 4

volume coming in ventricles