First slide

Circulatory Pathways

Question

Just before atrial systole,

Moderate

A

AV valves are open
B

SL valves are open
C

ventricles are in systole
D

ventricular filling is yet to begin

Solution

Just before atrial systole, all the four chambers of heart are in a relaxed state, (joint diastole). As the tricuspid and bicuspid valves are open, blood from the pulmonary veins and venae cavae flows into the left and the right ventricle respectively through the left and right atria. The semilunar valves are closed at this stage.

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