Definition
The cardiac cycle refers to the complete sequence of events in one heartbeat, including the contraction (systole) and relaxation (diastole) of the atria and ventricles. Think of it as a continuous loop of your heart pumping blood. The cycle ensures efficient blood circulation throughout your body, delivering oxygen and nutrients. It's a rhythmic and vital process, like a perfectly timed dance. Without it, cells would quickly starve. This process repeats approximately 60-100 times per minute in a resting adult. The rate and efficiency of the cycle are influenced by factors like exercise and stress.