The beginning of the cardiac cycle is when the
A)atria fill with blood.
B)ventricles fill with blood.
C)atria contract.
D)two semilunar valves close.
E)ventricles contract.

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The Answer of The beginning of the cardiac cycle is when the
A)atria fill with blood.
B)ventricles fill with blood.
C)atria contract.
D)two semilunar valves close.
E)ventricles contract.

The Beginning of the Cardiac Cycle Is When the