When do the 'lub' and 'dub' sounds occur duri | vedclass

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(A) The cardiac cycle involves two primary heart sounds:$1$. The first heart sound,'$lub$',is produced by the closure of the atrioventricular $(AV)$ v

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Closure of $AV$ valves $\quad$ Closure of semilunar valves

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(A) The cardiac cycle involves two primary heart sounds:$1$. The first heart sound,'$lub$',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,'$dub$',is produced by the closure of the semilunar valves at the beginning of ventricular diastole.Therefore,the correct sequence is: $Lub$ = Closure of $AV$ valves,$Dub$ = Closure of semilunar valves.

When do the 'lub' and 'dub' sounds occur during the cardiac cycle?
Lub $\quad$ $\quad$ $\quad$ Dub

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When do the 'lub' and 'dub' sounds occur during the cardiac cycle?Lub $\quad$ $\quad$ $\quad$ Dub