The cardiac cycle consists of a period of heart contraction called systole and a period of heart relaxation called diastole.

Name: The cardiac cycle consists of a period of heart contraction called systole and a period of heart relaxation called diastole.
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The cardiac cycle is divided into two main phases: systole, when the heart muscles contract to pump blood, and diastole, when the heart muscles relax to allow the chambers to fill with blood.

The Cardiac Cycle Consists of a Period of Heart Contraction