Question

what is the sound of heart beat​

Answer 1

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Sounds of Heartbeat -> Lubb and Dup

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Answer 2

Answer:

"lub" is the sound of tricuspid and mitral valve closing. The "Dub" is the sound of aortic and pulmonary valves closing. Together they're the sound of some one heart doing its job . the distinctive sound of the heartbeat- lub-dub,lub-dub,lub-dub, comes from the closure of pairs of heart valves..