Cardiac Cycle
(Learning Activities)
Background Information

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)
Terms of Use
Human Bio Media materials are open-source and can be adapted and shared by anyone according to the Creative Commons Attribution 4.0 License guidelines.
If you are redistributing Human Bio Media materials in print or digital formats, you should include on every page the following attribution:
Access it for free at https://humanbiomedia.org/