What are the two main phases of a heartbeat?

Answer 1

There is the contraction of the atria and the contraction of the ventricles. When the atria contract, the AV valves are open, allowing the blood to fall into the ventricles. The AV valves then close, and the ventricles contract, pumping the blood out into the arteries.

Answer 2

The two phases of the cardiac cycle are systole and diastole.

Answer 3

The two main phases of a heartbeat are systole and diastole. Systole is the contraction phase when the heart pumps blood out, while diastole is the relaxation phase when the heart fills with blood.

Answer 4

systole and diastole

Answer 5

systole diastole