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The Aortic and Pulmonary Semilunar Valves Prevent Backflow of Blood

Question 102

Multiple Choice

The aortic and pulmonary semilunar valves prevent backflow of blood from the:


A) ventricles to the atria when the ventricles relax
B) arteries to the ventricles when the ventricles contract
C) ventricles to the atria when the ventricles contract
D) arteries to the ventricles when the ventricles relax

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