What events are involved in the generation of an activation potential?
A graded depolarization brings an area of excitable membrane to threshold (-60mV).
Voltage-gated sodium channels open and sodium ions move into the cell. The transmembrane potential rises to +30mV
Sodium channels close, voltage-gated potassium channels open, and potassium ions move out of the cell. Repolarization begins.
Potassium channels close, and both sodium and potassium channels return to their normal states.