During Atrial Systole,the

Question

During atrial systole,the
A) AV valves are closed.
B) ventricles are relaxed.
C) ventricles are in systole.
D) semilunar valves are open.

Accepted Answer

During atrial systole, the atria contract to push blood into the ventricles, which are relaxed at this time to receive the blood. This means the AV (atrioventricular) valves are open, not closed, to allow blood flow into the ventricles, and the semilunar valves are closed to prevent backflow into the arteries.