Biology · Human Physiology
The second heart sound 'dub' (or 'dupp') is produced when:
Verified Solution4 OptionsUpdated: October 2026👁️1 View
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- 1Tricuspid valve is opened
- 2Mitral valve is opened
- 3Mitral valve is closed
- 4Semilunar valves are closed✓
Correct answer
Semilunar valves are closed
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