The characteristic Lubb-Dupp heart sounds are | vedclass

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(D) The first heart sound,'$Lubb$',is produced by the closure of the $tricuspid$ and $bicuspid$ (mitral) valves at the beginning of ventricular systol

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Closure of $semilunar$ valves,and closure of $tricuspid$ and $bicuspid$ valves

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(D) The first heart sound,'$Lubb$',is produced by the closure of the $tricuspid$ and $bicuspid$ (mitral) valves at the beginning of ventricular systole.The second heart sound,'$Dupp$',is produced by the closure of the $semilunar$ valves (aortic and pulmonary valves) at the beginning of ventricular diastole.Therefore,the characteristic '$Lubb-Dupp$' sounds are caused by the sequential closure of these valves.

The characteristic $Lubb-Dupp$ heart sounds are produced due to which of the following?

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