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Cardiac Cycle

(Learning Activities)

Background Information

cardiac cycle phase events

The cardiac cycle is the sequence of events that occurs during a single heartbeat. During a cardiac cycle, both the atria and ventricles undergo periods of contraction (systole) and relaxation (diastole), which are coordinated by the heart’s pacemaker cells.

Phases of the Cardiac Cycle

(Phase Events Slider)

Phases of the Cardiac Cycle

(Interactive Phase Diagram and Narration)

Phases of the Cardiac Cycle

(Interactive Wigger Diagram and Narration)

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