| 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 |
