A Complete Guide on Cardiac Cycle

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The cardiac cycle is the sequence of events in one heartbeat, ensuring blood is pumped efficiently throughout the body. It consists of two main phases:

Systole (Contraction Phase) – The heart contracts, pumping blood out of the ventricles to the lungs and body.

Diastole (Relaxation Phase) – The heart relaxes, allowing the chambers to fill with blood for the next beat.

The cycle is regulated by electrical signals from the SA node (pacemaker) and maintains circulation, delivering oxygen and nutrients to tissues.