(C) The first heart sound,commonly known as '$Lubb$',is produced during the cardiac cycle.It occurs at the beginning of ventricular systole.This sound

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Lubb at the beginning of ventricular systole

(C) The first heart sound,commonly known as '$Lubb$',is produced during the cardiac cycle.It occurs at the beginning of ventricular systole.This sound is caused by the sudden closure of the atrioventricular $(AV)$ valves (tricuspid and bicuspid valves) due to the increase in ventricular pressure.