| Systole | Diastole |
|---|---|
| $(1)$ It is the contraction of the heart chambers to drive blood into the aorta and the pulmonary artery. | $(1)$ It is the relaxation of the heart chambers between two contractions. During diastole, the chambers are filled with blood. |
| $(2)$ Systole decreases the volume of the heart chambers and forces the blood out of them. | $(2)$ Diastole brings the heart chambers back into their original sizes to receive more blood. |
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