Question

THE rhythmic expansion and contraction of the heart is called

Answer 1

Explanation:

Tje rhythmic expansion and contraction of heart is called cardiac cycle .

One complete contraction and relaxation of the heart is called a heart beat .

I hope it's helpful for all of you.

If yes, then please mark me brainiest and also click on ❣️ for Thanksgiving to me ☺️☺️