The driving force for heart contraction is
A) contraction of the atria.
B) contraction of the ventricles.
C) closing of the AV valves.
D) opening of the AV valves.
E) closing of the aortic valve.

Question

Quizplus · Accepted Answer

The driving force for heart contraction is the contraction of the ventricles, which forces blood out of the heart and into the circulatory system. The contraction of the atria, closing of the AV valves, opening of the AV valves, and closing of the aortic valve are all important components of the overall cardiac cycle, but they are not the primary driving force for heart contraction.

The Driving Force for Heart Contraction Is