The second heart sound is heard during which phase of the cardiac cycle?
A) isovolumetric relaxation
B) ventricular filling
C) ventricular ejection
D) isovolumetric contraction

Question

Quizplus · Accepted Answer

The second heart sound, also known as S2, is associated with the closure of the aortic and pulmonary valves at the beginning of ventricular diastole, marking the end of ventricular systole. This event occurs during the isovolumetric relaxation phase of the cardiac cycle, when the ventricles are relaxing but all valves are closed, preventing blood flow into or out of the ventricles.

The Second Heart Sound Is Heard During Which Phase of the Cardiac