During which phase of the cardiac cycle are all heart valves simultaneously open?

Show Answers

Phase of blood ejection from the ventriclesPeriod when the ventricles relax without volume changePhase of ventricular contraction without volume changeNo such phase exists

Explanation

None of the cardiac cycle phases involve all heart valves being open at the same time. During systolic ejection, semilunar valves are open but atrioventricular valves are closed. In isovolumetric relaxation and contraction phases, all valves are closed. Therefore, no phase has all valves open simultaneously.