The Mitral and Tricuspid Valves Close After the Ventricles Are

Multiple Choice

The mitral and tricuspid valves close after the ventricles are filled with blood because the:

A) chordae tendineae relax, which allows the valves to close.
B) increased pressure in the ventricles pushes the valves to close.
C) trabeculae carneae contract, which pulls the valves closed.
D) reduced pressure in the atria creates a negative pressure that pulls the valves closed.