cardiac cycle

Question 1

what is the cardiac cycle

Answer 1

control and coordination of the heart

Question 2

what are the stages of cardiac cycle

Answer 2

atrial systole, ventricular systole, diastole

Question 3

what happens during diastole

Answer 3

muscles are relaxed
atria fill with blood
AV valves open
blood enters ventricles
semi lunar valve in pulmonary artery + aorta shut, pressure in ventricles is lower than in arteries

Question 4

what happens during atrial systole

Answer 4

atria contract
blood pressure increases, is forced into ventricles
semi lunar valves shut as blood pressure in ventricles is lower than arteries

Question 5

what happens during ventricular systole

Answer 5

ventricles contract
walls are thick and stronger than atria, pressure higher
blood is forced into aorta
semilunar valve open
atrioventricular valve close

Question 6

how to calculate cardiac output

Answer 6

stroke volume x heart rate