Semilunar valves regulate the flow of blood from the ventricles into which vessels?

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Multiple Choice

Semilunar valves regulate the flow of blood from the ventricles into which vessels?

Semilunar valves sit between the ventricles and the major arteries leaving the heart, controlling flow as the heart contracts and relaxes. When the ventricles contract, the aortic valve opens to allow blood into the aorta and the pulmonary valve opens to send blood into the pulmonary trunk. They also prevent blood from flowing back into the ventricles when the ventricles relax. So, these valves regulate flow into the aorta and the pulmonary trunk. The other vessels listed aren’t regulated by these valves: the vena cavae return blood to the right atrium, pulmonary veins return blood to the left atrium, and coronary arteries originate from the aorta but aren’t controlled by the semilunar valves.

Semilunar valves sit between the ventricles and the major arteries leaving the heart, controlling flow as the heart contracts and relaxes. When the ventricles contract, the aortic valve opens to allow blood into the aorta and the pulmonary valve opens to send blood into the pulmonary trunk. They also prevent blood from flowing back into the ventricles when the ventricles relax. So, these valves regulate flow into the aorta and the pulmonary trunk.

The other vessels listed aren’t regulated by these valves: the vena cavae return blood to the right atrium, pulmonary veins return blood to the left atrium, and coronary arteries originate from the aorta but aren’t controlled by the semilunar valves.

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