Which of these events is happening during the isovolumetric phase of ventricular systole
A)The ventricles are relaxed isometrically.
B)The atrioventricular valves and semilunar valves are closed.
C)Blood is being ejected into the great vessels.
D)Venous blood is flowing back to the heart.

Question

Quizplus · Accepted Answer

During the isovolumetric phase of ventricular systole, the ventricles are contracting but the atrioventricular valves and semilunar valves are both closed. This means that no blood is being ejected from the heart and no blood is flowing back from the circulation. The isovolumetric phase ends when the pressure in the ventricles exceeds that of the great vessels, causing the semilunar valves to open and blood to be ejected.

Which of These Events Is Happening During the Isovolumetric Phase