There are two phases of the cardiac cycle in which all four heart valves are open: the isovolumetric contraction phase and the isovolumetric relaxation phase.

Question

Quizplus · Accepted Answer

During the isovolumetric contraction and relaxation phases, all heart valves are actually closed. The two phases in which all four heart valves are open are the rapid inflow phase and the slow outflow phase.

There Are Two Phases of the Cardiac Cycle in Which