The first heart sound 'Lubb' occurs in which | vedclass

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(C) The first heart sound '$Lubb$' is produced by the closure of the atrioventricular $(AV)$ valves.This event occurs at the beginning of ventricular

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Ventricular systole

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(C) The first heart sound '$Lubb$' is produced by the closure of the atrioventricular $(AV)$ valves.This event occurs at the beginning of ventricular systole.When the ventricles begin to contract,the intraventricular pressure rises rapidly,exceeding the atrial pressure.This pressure difference forces the $AV$ valves (tricuspid and bicuspid) to close,preventing the backflow of blood into the atria.The vibration caused by the sudden closure of these valves creates the low-pitched '$Lubb$' sound.

The first heart sound '$Lubb$' occurs in which phase of the cardiac cycle?

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