18. The Heart
Cardiac Action Potentials
18. The Heart
Cardiac Action Potentials
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- Multiple Choice
Which of the following correctly identifies a difference between action potentials in cardiac and skeletal muscle?
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Calcium ion channels open in response to changes in membrane potential. What type of opening mechanism do calcium ion channels in cardiac muscle exhibit?
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Autorhythmicity is a unique feature of cardiac pacemaker cells. What feature of cardiac pacemaker cells allows them to be autorhythmic while other cardiac cells are not?
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Cardiac contractile tissue uses sodium, calcium, and potassium channels for depolarization and repolarization. During which phase of the action potential is the calcium channel open?
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![Cardiac Myocyte Action Potential Phases Made Easy [Heart Muscle vs Pacemaker Physiology Animation]](https://img.youtube.com/vi/Wip-A4ZkmiE/mqdefault.jpg)

