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‘Dup’ sound is produced during closure of

1. Semilunar valves
2. Bicuspid valve
3. Tricuspid valve
4. Both b and c

Correct answer: Semilunar valves

Solution

The “dup” sound is the second heart sound (S2), produced when the semilunar valves close at the end of ventricular systole. This closure prevents backflow from the aorta and pulmonary artery into the ventricles.

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