- is a period during which inward and outward currents are equal and the membrane potential approaches the K+ equilibrium potential.
- is normally the pacemaker of the heart.
- does not have a constant resting potential.
- exhibits phase 4 depolarization, or automaticity.
- The AV node and the His-Purkinje systems are latent pacemakers that may exhibit automaticity and override the SA node if it is suppressed.
- The intrinsic rate of phase 4 depolarization (and heart rate) is fastest in the SA node and slowest in the His-Purkinje system:
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