Which one of the following statements is correct?

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Blood moves freely from atrium to the ventricle during joint diastole.

The atrio-ventricular node (AVN) generates an action potential to stimulate atrial contraction.

The tricuspid and the biscuspid valves open due to the pressure exerted by the simultaneous contraction of the atria.

Increased ventricular pressure causes closing of the semilunar valves.

answer is B.

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Detailed Solution

During joint diastole stage AV valves open and passive filling of ventricle occurs. The tricuspid and the bicuspid valves open due to the fall in the ventricular pressure during the joint diastole itself (not during atrial systole). Increased ventricular pressure causes closing of the atrioventricular (bicuspid and tricuspid) valves. Atrial contraction is stimulated by the action potentials generated by the SA node.

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