During the cardiac cycle,what makes the mitral and tricuspid valves close after the ventricles are filled with blood?
A) The chordae tendineae relax,which allows the valves to close.
B) The increased pressure in the ventricles pushes the values to close.
C) The trabeculae carneae contract,which pulls the valves closed.
D) The reduced pressure in the atria creates a negative pressure that pulls the valves closed.

Question

Quizplus · Accepted Answer

The increased pressure in the ventricles pushes the valves to close. When the pressure inside the ventricles exceeds the pressure within the atria, the pressure gradient causes the mitral and tricuspid valves to close. This prevents blood from flowing back into the atria during the subsequent ventricular contraction.

During the Cardiac Cycle,what Makes the Mitral and Tricuspid Valves