In the cardiac cycle, which statement is true of blood flow from the atria to the ventricles?
A)All blood flows passively.
B)Most blood flows passively.
C)Most blood is actively pumped.
D)All blood is actively pumped.

Question

Quizplus · Accepted Answer

During the cardiac cycle, most of the blood flows passively from the atria to the ventricles. The atria contract to help push the remaining blood into the ventricles, but the majority of the blood flow is due to pressure differentials and the relaxation of the heart muscle.

In the Cardiac Cycle, Which Statement Is True of Blood