Doctors use a stethoscope to hear the sounds | vedclass

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(B) The cardiac cycle produces two primary heart sounds,often described as 'lub' and 'dub'.$1$. The first heart sound ('lub') is associated with the c

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

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(B) The cardiac cycle produces two primary heart sounds,often described as 'lub' and 'dub'.$1$. The first heart sound ('lub') is associated with the closure of the atrioventricular $(AV)$ valves (tricuspid and bicuspid valves) at the beginning of ventricular systole.$2$. The second heart sound ('dub') is associated with the closure of the semilunar valves (aortic and pulmonary valves) at the end of ventricular systole,preventing the backflow of blood from the arteries into the ventricles.Therefore,the second sound is heard when the semilunar valves close.

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

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