What is the actual sound that we heard during heart beat?
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Put your head on someone's chest and theheartbeat sounds a bit like lub-DUB, lub-DUB, lub-DUB. The" lub" is the sound of the tricuspid and mitral valves closing. The" DUB" is the sound of the aortic and pulmonary valves closing. ... The second sound occurs as a result of closure of the pulmonic and aortic valves.
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