When is the 'DUB' sound heard during the card | vedclass

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(C) The cardiac cycle produces two primary heart sounds,'$LUB$' and '$DUB$'.$1$. The first heart sound,'$LUB$',is produced by the closure of the atrio

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When the semilunar valves close

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(C) The cardiac cycle produces two primary heart sounds,'$LUB$' and '$DUB$'.$1$. The first heart sound,'$LUB$',is produced by the closure of the atrioventricular valves (tricuspid and mitral valves) at the beginning of ventricular systole.$2$. The second heart sound,'$DUB$',is produced by the closure of the semilunar valves (aortic and pulmonary valves) at the beginning of ventricular diastole.Therefore,the '$DUB$' sound is associated with the closure of the semilunar valves.

When is the '$DUB$' sound heard during the cardiac cycle?

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