Ventricular filling begins in joint diastole even before the contraction of atria. Which of the following is responsible for such a filling?

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Decrease in ventricular pressure causes closure of semilunar valves

Increase in ventricular pressure opens the AV valves

SAN can not conduct action potentials to ventricles.

Pressure exerted by the blood in atria exceeds that of ventricles which opens AV valves

answer is D.

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Detailed Solution

During the joint diastole, as the ventricles continue to relax, the pressure falls quickly. When ventricular pressure drops below atrial pressure, the AV valves open, and ventricular filling begins. Blood that has been flowing into and building up in the atria during ventricular systole rushes rapidly into the ventricles. Major part of ventricular filling occurs just after the AV valves open. At the end of the relaxation period, the ventricles are about threequarters full.

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