What happens to the heart during diastole?

During diastole, the heart undergoes a phase of relaxation following the contraction phase known as systole. This relaxation allows the chambers of the heart, particularly the ventricles, to fill with blood. As the heart muscle relaxes, the ventricles expand, creating a negative pressure that draws blood in from the atria. This filling is crucial for ensuring that there is enough blood available to be pumped out during the next contraction.

The process of filling with blood during diastole is vital for maintaining adequate circulation, as it helps regulate the volume of blood that the heart will subsequently eject with each heartbeat. This filling phase is essential for the overall efficiency and functionality of the cardiovascular system, as it allows the heart to manage the blood flow required to meet the body's needs effectively.