In heart beat the "lub" is sound is result of (a)close of valves between atria and ventricles (b)close of valves in the aorta and pulmonary artery (c)open of valves between atria and ventricles (d)open of valves in aorta and pulmonary artery
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option a is correct I also search in book
option c is totally wrong answer
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a)close of valves between atria and ventricles that is closing of tricuspid valve .
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