Biology, asked by Toushif3234, 10 months ago

When are the sounds lubb and dubb produced rspectively during heart beat ?

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Answered by keshavsharma58
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Answer:

Normally, two distinct sounds are heard through the stethoscope: a low, slightly prolonged “lub” (first sound) occurring at the beginning of ventricular contraction, or systole, and produced by closure of the mitral and tricuspid valves, and a sharper, higher-pitched “dup” (second sound), caused by closure of aortic ...

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