Which of the Following is the Best Description of Systole

Question

Which of the following is the best description of systole and diastole?
A) Atria and ventricles
B) Depolarization and repolarization
C) Contraction and relaxation
D) Heart rate and stroke volume

Accepted Answer

Systole is the period of cardiac cycle when the heart muscles contract and pump blood out of the chambers, while diastole is the period of relaxation and filling of the chambers with blood. Therefore, contraction and relaxation is the best description of systole and diastole.