The Lubb sound is produced during the closure | vedclass

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(D) The cardiac cycle involves two primary heart sounds,$Lubb$ and $Dupp$.$1$. The first heart sound,$Lubb$ $(S1)$,is produced due to the simultaneous

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Both $(a)$ and $(b)$

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(D) The cardiac cycle involves two primary heart sounds,$Lubb$ and $Dupp$.$1$. The first heart sound,$Lubb$ $(S1)$,is produced due to the simultaneous closure of the atrioventricular valves,which are the bicuspid (mitral) valve and the tricuspid valve,at the beginning of ventricular systole.$2$. The second heart sound,$Dupp$ $(S2)$,is produced due to the closure of the semilunar valves (aortic and pulmonary valves) at the end of ventricular systole.Therefore,the $Lubb$ sound is produced by the closure of both the bicuspid and tricuspid valves.

The $Lubb$ sound is produced during the closure of which of the following?

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