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Introduction: The Action Potential (Page 1 of 19) Goals (Page 2 of 19) The Action Potential: An Overview (Page 3 of 19) The Action Potential Begins at the Axon Hillock (Page 4 of 19) During Depolarization Na+ Moves Into the Neuron (Page 5 of 19) Threshold (Page 6 of 19) An Action Potential Is Generated (Page 7 of 19) Voltage-gated Na+ Channels Inactivate (Page 8 of 19) Voltage-gated K+ Channels Open (Page 9 of 19) Repolarization (Page 10 of 19) Hyperpolarization (Page 11 of 19) Channel Opening and Closing Changes Permeability (Page 12 of 19) Ion Channel Activity During the Action Potential: A Summary (Page 13 of 19) The Absolute Refractory Period (Page 14 of 19) The Relative Refractory Period (Page 15 of 19) The Action Potential Is Propagated Along the Axon (Page 16 of 19) Velocity Depends on Diameter and Myelination (Page 17 of 19) Summary (Page 18 of 19) Textbook References (Page 19 of 19)