During joint diastole,

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both semilunar valves and atrioventricular valves close

semilunar valves open and atrioventricular valves close

both semilunar valves and atrioventricular valves open

semilunar valves close and atrioventricular valves open

answer is A.

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Detailed Solution

During joint diastole, the ventricles relax and the ventricular pressure falls causing the closure of semilunar valves which prevents the back-flow of blood into the ventricles. As the ventricular pressure declines further, the tricuspid and bicuspid valves are pushed open by the pressure in the atria exerted by the blood which was being emptied into them by the veins. The blood now once again moves freely to the ventricles.

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Best Online Course for IIT JEE

Best Online Course for NEET

Best Online Course for CBSE