Biology, asked by syedasma182gmailcom, 3 months ago

where the ventricles filled with blood atria start relaxing
on ventricular contraction due to pressure blood into aorta and pulmonary artery the aperture between atria and ventricles is close by values when the atria ventricular value are closed force bully it creates first sharp sound lub

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Answered by Anonymous

7

Clearify your question first! Thanks!

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