| Introduction |
During this phase of the cardiac cycle, heart chambers are relaxed and filling with blood. |
During this phase of cardiac cycle, heart chambers contract and pump blood to the lungs and the rest of the body. |
| State of blood chambers |
Both atria and ventricles are in a state of relaxation |
Ventricles are relaxed, and atria contracts |
| Blood Filling |
Blood is passively flowing into the atria and ventricles |
Blood is actively pumped out of the heart into the pulmonary artery (right ventricle) and aorta (left ventricle) |
| Pressure in Heart Chambers |
Lower pressure in the heart chambers during diastole |
Higher pressure in the heart chambers during systole |
| Duration |
Longer duration as compared to systole |
Shorter duration as compared to diastole |
| Electrical activity |
Depolarization of the heart muscle is initiated, leading to the P wave in the electrocardiogram (ECG) |
Depolarization continues, leading to the QRS complex in the ECG |
