In what phase is the cardiac cycle when the semilunar valves are open and AV valves are closed?
A) atrial contraction
B) ventricular filling
C) isovolumetric contraction
D) isovolumetric relaxation
E) ventricular ejection

Question

Quizplus · Accepted Answer

During the ventricular ejection phase of the cardiac cycle, the semilunar valves (aortic and pulmonary valves) are open to allow blood to be ejected from the ventricles into the aorta and pulmonary artery, respectively. At the same time, the atrioventricular (AV) valves (mitral and tricuspid valves) are closed to prevent backflow of blood into the atria.

In What Phase Is the Cardiac Cycle When the Semilunar