1(iii)
The heart sound 'Dup' is produced when:
- (a)Semilunar valves open
- (b)Atrio ventricular valves close
- (c)Semilunar valves close
- (d)Atrio ventricular valves open
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Semilunar valves close
Reason — 'Dup' sound is produced at the beginning of ventricular diastole when the semilunar valve at the root of aorta and pulmonary artery close.