What phase of the cardiac cycle is the heart in when all four valves of the heart are closed and ventricular pressure is building, but is not yet great enough to open a valve?
A)isovolumetric relaxation
B)ventricular ejection
C)isovolumetric contraction
D)ventricular filling
E)none

Question

Quizplus · Accepted Answer

During isovolumetric contraction, all heart valves are closed, and the ventricles contract, increasing pressure without changing volume until the pressure is high enough to open the semilunar valves.

What Phase of the Cardiac Cycle Is the Heart in When