Contraction of the ventricles causes:
A) closure of the atrioventricular valves.
B) closure of the pulmonic and aortic valves.
C) opening of the auricular septa.
D) opening of the mitral and tricuspid valves.

Question

Quizplus · Accepted Answer

When the ventricles contract the semilunar valves, the pulmonic and aortic valves open, causing blood to rush into the pulmonary artery and the aorta. At this time, the tricuspid and mitral valves close, preventing backflow into the atria. When the atria contract, the tricuspid and mitral valves open, allowing blood flow into the ventricles. When the ventricles relax during diastole (ventricles are filling), the aortic and pulmonic valves close, preventing backflow into the ventricles.

Contraction of the Ventricles Causes