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What is are heat sounds ? How are ...

What is are heat sounds ? How are they produced ?

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(i) the rhythmic closure and opening of the valves cause the sound of the heart .
(ii ) The first sound LUBB is of longer duration and is produced by the closeure of the tricuspid and bicuspid ststole .
(iii ) the second sound DUPP is of shorter duration and produced by the closure of semilunar valves at the end of ventricular systole .
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