A doctor uses a stethoscope to hear the sound | vedclass

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(D) During the cardiac cycle,two primary heart sounds are produced. $1$. The first heart sound,'$Lubb$',is associated with the closure of the atrioven

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When the semilunar valves close as blood enters the arteries from the ventricles.

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(D) During the cardiac cycle,two primary heart sounds are produced. $1$. The first heart sound,'$Lubb$',is associated with the closure of the atrioventricular $(AV)$ valves. $2$. The second heart sound,'$Dupp$',is produced when the semilunar valves close at the beginning of ventricular diastole. This closure prevents the backflow of blood from the pulmonary artery and aorta into the ventricles,marking the end of ventricular systole.

$A$ doctor uses a stethoscope to hear the sounds produced during each cardiac cycle. When is the second heart sound heard?

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