During the cardiac cycle,what makes the aortic and pulmonic valves close after the ventricles contract?
A) The papillary muscles relax,which allows the valves to close.
B) Chordae tendineae contract,which pulls the valves closed.
C) Reduced pressure in the ventricles creates a negative pressure,which pulls the valves closed.
D) Blood fills the cusps of the valves and causes the edges to merge,closing the valves.

Question

Quizplus · Accepted Answer

The aortic and pulmonic valves close due to the backflow of blood filling the cusps of the valves, which causes the edges to come together and close the valves, preventing backflow into the ventricles.

During the Cardiac Cycle,what Makes the Aortic and Pulmonic Valves