During ventricular diastole:

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(C) Ventricular diastole is the phase of the cardiac cycle where the ventricles relax. $1$. As the ventricles relax,the ventricular pressure drops sig

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The semilunar valves close.

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(C) Ventricular diastole is the phase of the cardiac cycle where the ventricles relax. $1$. As the ventricles relax,the ventricular pressure drops significantly. $2$. Due to the drop in pressure,the blood in the arteries (aorta and pulmonary artery) attempts to flow back into the ventricles. $3$. This backflow causes the semilunar valves to close,which produces the second heart sound (dub). $4$. Therefore,the closure of semilunar valves is a characteristic event during the early phase of ventricular diastole.

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