1(iv)
During ventricular systole, the atrioventricular valves (P) ............... and semilunar valves (Q) ............... .
- (a)P-close, Q-open
- (b)P-close, Q-close
- (c)P-open, Q-close
- (d)P-open, Q-open
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P-close, Q-open
Reason — During ventricular systole, which is the phase of the cardiac cycle when the ventricles contract to pump blood out of the heart, the atrioventricular valves (P) closes and semilunar valves (Q) opens.