The first heart sound is caused by the closur | vedclass

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(C) The heart produces two primary sounds during each cardiac cycle,known as '$Lubb$' and '$Dupp$'.$1$. The first heart sound,'$Lubb$',is produced by

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Closure of mitral and tricuspid valves

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(C) The heart produces two primary sounds during each cardiac cycle,known as '$Lubb$' and '$Dupp$'.$1$. The first heart sound,'$Lubb$',is produced by the closure of the atrioventricular valves,which are the mitral (bicuspid) and tricuspid valves,at the beginning of ventricular systole.$2$. The second heart sound,'$Dupp$',is produced by the closure of the semilunar valves (pulmonary and aortic valves) at the beginning of ventricular diastole.Therefore,the first heart sound is associated with the closure of the mitral and tricuspid valves.

The first heart sound is caused by the closure of which valves?

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