| Diastole | Systole |
| It is the condition of the heart when the chambers relax. | It is the condition of the heart when the chambers of the heart contract. |
| It is the condition when the blood enters the chamber, e,g., when left atrium relaxes, blood enters from the pulmonary vein under low pressure. | It is the condition when the blood is pumped out of the heart, e.g., when the left ventricle contracts, the blood is pumped to the body under high pressure. |
