The phase of the cardiac cycle when the heart is expanding and refilling, also known as the relaxation phase, is:
A)systole.
B)diastole.
C)automaticity.
D)conductivity.

Question

Quizplus · Accepted Answer

Diastole is the phase of the cardiac cycle when the heart muscle relaxes and refills with blood. During this phase, the atria contracts first, followed by the ventricles. This phase accounts for the majority of the cardiac cycle and is important for maintaining proper blood flow and ventricular filling.

The Phase of the Cardiac Cycle When the Heart Is