Which valve is closed during heart relaxation to prevent blood from backflowing from the aorta into the heart?
A) bicuspid (mitral) valve
B) tricuspid valve
C) pulmonary semilunar valve
D) aortic semilunar valve

Question

Quizplus · Accepted Answer

During heart relaxation, the aortic semilunar valve (located between the left ventricle and the aorta) closes to prevent blood from flowing back into the heart from the aorta. The bicuspid (mitral) valve and tricuspid valve are located between the atria and ventricles and close during ventricular contraction to prevent blood from flowing back into the atria. The pulmonary semilunar valve is located between the right ventricle and pulmonary artery and prevents backflow into the right ventricle during relaxation.

Which Valve Is Closed During Heart Relaxation to Prevent Blood