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The cardiac cycle refers to the complete sequence of events that occurs in the heart during one heartbeat. It includes the contraction and relaxation of the atria and ventricles, resulting in the movement of blood through the heart and into the circulation. The cardiac cycle begins with the initiation of an electrical impulse in the sinoatrial (SA) node and ends just before the next heartbeat begins. In a healthy adult with a heart rate of about 75 beats per minute, one cardiac cycle lasts approximately 0.8 seconds. Understanding the cardiac cycle is fundamental in applied physiology because it explains the mechanical and electrical functions of the heart and their relationship with blood flow, blood pressure, and tissue perfusion. The cardiac cycle is ____ _____ __________ __________ _____ _____ _____ _________ ________.
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