Cardiac Cycle Flashcards
(9 cards)
1
Q
Stage 1: Both atria…
A
…fill with blood.
AV valves are closed.
2
Q
Stage 2: Atrial blood pressure…
A
…rises above ventricular pressure.
3
Q
Stage 3: Rising blood pressure…
A
…forces AV valves open.
Blood passively passes into ventricles.
Semilunar valves are closed.
3
Q
Stage 4: Both atria contract actively…
A
…forcing the remaining blood into the ventricles.
4
Q
Stage 5: Semilunar valves…
A
…remain closed.
5
Q
Stage 6: Both ventricles…
A
…contract which increases ventricular pressure.
6
Q
Stage 7: Aortic and pulmonary…
A
… valves forced open.
AV valves are closed.
7
Q
Stage 8: Blood forced out…
A
…from Aorta to body tissues.
Blood forced out from pulmonary arteries to lungs
8
Q
Stage 9: Diastole of…
A
…the next cardiac cycle begins.
Semilunar valves close.
