Biology
The heart sound 'Dup' is produced when:
- Semilunar valves open
- Atrio ventricular valves close
- Semilunar valves close
- Atrio ventricular valves open
Circulatory System
ICSE 2023
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Answer
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.
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