Question

The contraction and relaxation of the heart is called the ​

Answer 1

Answer:

There contraction and relaxation of the heart is called Cardiac Cycle. Please mark me as BRAINLIEST.

Answer 2

Answer:Systole is the contraction phase of the cardiac cycle, and diastole is the relaxation phase. At a normal heart rate, one cardiac cycle lasts for 0.8 second.