Q.

Which of the following takes place during atrial systole?

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a

Opening of semilunar valves

b

Closure of atrio-ventricular valves

c

21mL of blood enters ventricles

d

49mL of blood enters ventricles

answer is C.

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Detailed Solution

During atrial systole, the 30% of stroke volume enters the ventricles through atrio-ventricular valves. Note that the AV valves are open, but SL valves are closed during atrial systole.

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