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The second heart sound is produced...

The second heart sound is produced

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The lub-dup sounds are produced by heart. The first sound .lub. is caused by slosure of the AV valves at the beginning of ventricular systole and preventing the back flow of blood. The second heart sound .dup. results from the slosure of the semilunar valves at the beginning of ventricle diastole and prevents the back flow of blood.
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