atrial diastole

Atrial diastole is the phase when the upper chambers of the heart, called atria, relax after contracting. During this relaxation, blood flows passively into the atria from the lungs and body. This filling prepares the atria for the next heartbeat. Once the atria are adequately filled, they contract to push blood into the lower chambers (ventricles), ensuring efficient blood circulation. Atrial diastole occurs midway through the heart's cycle and is essential for maintaining a continuous and coordinated heartbeat, allowing the heart to effectively supply oxygen-rich blood to the body and remove waste products.