Assertion : Lub is a heart sound which is pro | vedclass

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(A) $Lub$ and $Dub$ are two heart sounds produced during each cardiac cycle.$Lub$ is the first heart sound,which is produced due to the closure of the

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If both Assertion and Reason are correct and the Reason is a correct explanation of the Assertion.

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(A) $Lub$ and $Dub$ are two heart sounds produced during each cardiac cycle.$Lub$ is the first heart sound,which is produced due to the closure of the atrioventricular valves (tricuspid and bicuspid valves) at the beginning of ventricular systole.It is a low-pitched sound of longer duration (approximately $0.15 \,sec$).Since the assertion states that $Lub$ is produced during the cardiac cycle and the reason correctly identifies its cause as the closure of the atrioventricular valves,both statements are correct and the reason explains the assertion.

Assertion : $Lub$ is a heart sound which is produced during each cardiac cycle.
Reason : It is associated with the closure of the tricuspid and bicuspid valves.

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Assertion : $Lub$ is a heart sound which is produced during each cardiac cycle.Reason : It is associated with the closure of the tricuspid and bicuspid valves.