The first heart sound produced,which can be h | vedclass

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(A) The heart produces two main sounds during each cardiac cycle,commonly referred to as 'lub' and 'dub'.$1$. The first heart sound,'$S_1$' or 'lub',i

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Closure of bicuspid and tricuspid valves

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(A) The heart produces two main sounds during each cardiac cycle,commonly referred to as 'lub' and 'dub'.$1$. The first heart sound,'$S_1$' or 'lub',is produced by the closure of the atrioventricular valves (bicuspid and tricuspid valves) at the beginning of ventricular systole.$2$. The second heart sound,'$S_2$' or 'dub',is produced by the closure of the semi-lunar valves at the end of ventricular systole.$3$. Therefore,the first sound is associated with the closure of the bicuspid and tricuspid valves.

The first heart sound produced,which can be heard through a stethoscope,is due to:

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