Cardiac Cycle

Description

The cardiac cycle is the sequence of events in one heartbeat, consisting of systole (contraction) and diastole (relaxation) of the atria and ventricles. It begins with atrial systole, pushing blood into the ventricles, followed by ventricular systole, ejecting blood into the aorta and pulmonary artery. Diastole allows chambers to refill with blood. The cycle maintains unidirectional blood flow, regulated by heart valves. It lasts about 0.8 seconds, ensuring efficient circulation and oxygen delivery throughout the body during each heartbeat.