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Key Term: Action Potential
Rapid sequence of voltage changes across the axonal membrane initiated when membrane potential reaches threshold (~ -55mV).
Source: Slide 12, Diagram 3Depolarization vs Repolarization
- Depolarization: Voltage-gated Na+ channels open rapidly; Na+ influx moves Vm toward +40mV.
- Repolarization: Na+ channels inactivate; delayed-rectifier K+ channels open, allowing K+ efflux.
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