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CGP EDU Academic Team
Published on: August 14, 2026
Closure of which of the following valves makes louder sound of heart beat?
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Auriculo-Ventricular valves
The " lub" is the first heart sound, commonly termed S 1 , and is caused by turbulence caused by the closure of mitral and tricuspid valves at the start of the systole. The second sound," dub" or S2, is caused by the closure of aortic and pulmonic valves, marking the end of systole.
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