Describe the events in cardiac cycle?

The cardiac cycle is the sequence of events that occur in one complete heartbeat, including contraction and relaxation of the heart chambers.

Phases of the Cardiac Cycle

1. Atrial Systole: The atria contract, pushing blood into the ventricles through open valves.
2. Ventricular Systole: The ventricles contract, closing the atrioventricular valves and pumping blood into the arteries.
3. Diastole: The heart muscles relax, and the chambers fill with blood again.

Duration and Sequence

The complete cardiac cycle lasts about 0.8 seconds in a normal adult.

Importance

This cycle ensures continuous blood flow through the lungs and body, maintaining oxygen and nutrient supply to tissues.