Question:medium
‘Lub’ sound of Heart is caused by the___________.
‘Lub’ sound of Heart is caused by the___________.
Updated On: Nov 26, 2025
- closure of the semilunar values
- opening of tricuspid and bicuspid values
- opening of the semilunar valves
- closure of the tricuspid and bicuspid valves
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The Correct Option is D
Solution and Explanation
Atrial regurgitation is prevented by the closure of the atrioventricular valves (tricuspid and mitral) at the onset of ventricular contraction, producing the S1, or "lub," sound. The S2, or "dub," sound arises from the closure of the semilunar valves (pulmonary and aortic).
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