The cardiac cycle describes the complete sequence of events that occurs with each heartbeat — from atrial contraction and ventricular filling, through isovolumetric contraction and ventricular ejection, to isovolumetric relaxation and passive filling again. Understanding the cardiac cycle also means understanding how it connects to the ECG. Use the practice activities below to master each stage of the cycle and the electrical events that drive it.
Cardiac Cycle Flashcards
Use these flashcards to learn about the cardiac cycle, or to review.
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Multiple Choice
Test your understanding of the cardiac cycle with these multiple choice questions.
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Cardiac Cycle Click-on Challenges
Master visual representation of the cardiac cycle with these click-on challenges.
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Free Response Questions
Get feedback on your ability to explain the cardiac cycle with AI coaching.
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What’s Next?
Continue to next tutorial: Cardiac Physiology
Attribution: Portions of the content on this page were adapted from Anatomy and Physiology by OpenStax, used under CC BY 4.0.