Which of the Following is a Correct Valvular Position When

Question

Which of the following is a correct valvular position when the atria are contracting?
A) The tricuspid valve is closed
B) The pulmonic valve is open
C) Both semilunar valves are open
D) Both AV valves are open

Accepted Answer

When the atria are contracting, the ventricles are relaxed and filling with blood. Both AV valves (tricuspid and mitral) should be open to allow blood to flow into the ventricles. The semilunar valves should be closed because the pressure in the ventricles is still lower than the pressure in the arteries leaving the heart. The pulmonic valve and aortic valve will open later, when the ventricles contract and force blood out of the heart.