During the isovolumetric contraction period of the cardiac cycle,
A) AV and semilunar valves are closed.
B) the atria are contracted.
C) ventricular volume increases.
D) blood is pumped into the large arteries.
E) pressure in the ventricles decreases.

Question

Quizplus · Accepted Answer

During the isovolumetric contraction period, both the atrioventricular (AV) valves and the semilunar valves are closed. This phase occurs right after the ventricles have been filled and the ventricles begin to contract, but before the pressure in the ventricles is high enough to open the semilunar valves and eject blood into the arteries. There is no change in ventricular volume during this phase because all valves are closed, preventing blood from entering or exiting the ventricles.

During the Isovolumetric Contraction Period of the Cardiac Cycle