Question

question 9 of 10
isovolumetric relaxation and contraction in the cardiac cycle are the only times that......
all heart valves are closed.
the heart goes into asystole.
all heart valves are open.
oxygenated blood shunts to the right side of the heart and mixes with deoxygenated blood.

Explanation:

Isovolumetric relaxation and contraction in the cardiac cycle occur when all heart valves are closed, preventing blood from flowing in or out of the ventricles while the pressure changes within them. Asystole is when the heart stops effective contraction. All valves are not open during these phases, and there is no shunting of oxygen - ated blood to the right side during isovolumetric phases under normal conditions.

Answer:

A. All heart valves are closed.