Differences Between Pacemaker and Myocardial Cell Action Potential

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Figure HE.5 Slow response action potential

Pacemaker AP have the following features which differ from those of the myocardial cells:

• Less negative phase 4 membrane potential

• Less negative TP

• Spontaneous depolarization in phase 4

• Less steep slope in phase 0 (dependence on T type Ca2+ channels)

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