Question

contraction and relaxation of heart is called​

Answer 1

Answer:

Your answer:

Systole and diastole..

Explanation:

The period of contraction that the heart undergoes while it pumps blood into circulation is called systole.

The period of relaxation that occur as the chambers filled with blood is called diastole.

Hope it helps you..

Thanks...

Answer 2

Answer:

contraction -systole and relaxation diastole

Hope it helps you !!!!