The second heart sound occurs when the semilunar valves close.What does this mark
A)the start of the ejection period
B)the start of systole
C)the end of the ejection period
D)the start of isovolumetric contraction

Question

Quizplus · Accepted Answer

The closing of the semilunar valves marks the end of the ejection period, which is when blood is pumped out of the ventricles into the arteries. This is followed by the isovolumetric relaxation period, during which the ventricles relax and no blood is flowing in or out of them.

The Second Heart Sound Occurs When the Semilunar Valves Close