What is the cardiac cycle?
A) The passage of electrical impulses from the AV node to the SN node to heart muscle
B) The alternating relaxation and contraction of the heart chambers
C) The movement of blood from systemic to pulmonary circulation
D) The movement of blood from the heart to the lungs and then back to the heart

Question

Quizplus · Accepted Answer

The cardiac cycle refers to the sequence of events that occur as the heart beats, involving the alternating relaxation (diastole) and contraction (systole) of the atria and ventricles to pump blood throughout the body.

What Is the Cardiac Cycle