Doctors use a stethoscope to hear the sounds | vedclass

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(D) The cardiac cycle produces two main sounds,often described as 'lub' and 'dup'.$1$. The first heart sound,'lub',is associated with the closure of t

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Semilunar valves close down after the blood flows into vessels from the ventricles

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(D) The cardiac cycle produces two main sounds,often described as 'lub' and 'dup'.$1$. The first heart sound,'lub',is associated with the closure of the atrioventricular $(AV)$ valves.$2$. The second heart sound,'dup',is associated with the closure of the semilunar valves.$3$. This closure occurs at the end of ventricular systole,preventing the backflow of blood from the pulmonary artery and aorta into the ventricles.Therefore,the correct option is $(d)$.

Doctors use a stethoscope to hear the sounds produced during each cardiac cycle. The second heart sound is heard when:

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