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What is are heat sounds ? How are ...

What is are heat sounds ? How are they produced ?

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Lubb. and .Dupp . are the sounds of the heart / .Lubb. sound is produced by the ventricle - contraction . It arises due to clossing of mitral and tricuspid valve .
.dupp . is produced by ventricular diastole . This arises due to the clossing of the semi - lunar valves of two auricles .
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