When is the 'DUB' sound of the heart heard? | vedclass

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Question

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

Vedclass · Accepted Answer

When the semilunar valves at the base of the aorta and pulmonary artery close

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(C) The heart produces two primary sounds during the cardiac cycle: '$LUB$' 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 end of ventricular systole.Therefore,the '$DUB$' sound is heard when the semilunar valves close.

When is the '$DUB$' sound of the heart heard?

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