Mention the reason of heart sound .
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The reason for heart sound is the contraction and relaxation of auricles and ventricles.
When blood enters right auricle and flows into ventricle when the valves open the auricle relaxes and blood falls into right ventricle producing a dull sound . Now ventricles contract to send blood to lungs via pulmonary artery producing a sharp sound.
This produces a series of sound lup-dup,lup-dup..
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