Biology · Body Fluids and Circulation
The 'Lub' sound of the heart is caused by the ________.
Verified Solution4 OptionsUpdated: October 2026👁️1 View
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- 1closure of the semilunar valves
- 2opening of tricuspid and bicuspid valves
- 3opening of the semilunar valves
- 4closure of the tricuspid and bicuspid valves✓
Correct answer
closure of the tricuspid and bicuspid valves
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