The first heart sound is :- | vedclass

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Question

(B) The heart produces two main sounds during each cardiac cycle, which can be heard through a stethoscope.$1$. The first heart sound is known as '$Lu

Vedclass · Accepted Answer

'Lubb' sound produced at the beginning of ventricular systole

Vedclass · Answer

(B) The heart produces two main sounds during each cardiac cycle, which can be heard through a stethoscope.$1$. The first heart sound is known as '$Lubb$'. It is produced by the closure of the atrioventricular $(AV)$ valves (tricuspid and bicuspid valves) at the beginning of ventricular systole.$2$. The second heart sound is known as '$Dub$'. It is produced by the closure of the semilunar valves at the end of ventricular systole.Therefore, the first heart sound is the '$Lubb$' sound produced at the beginning of ventricular systole.

The first heart sound is $:-$

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