Along unmyelinated axons, an action potential propagates as depolarization spreads passively, opening adjacent voltage-gated Na+ channels, while the previous region repolarizes and enters a refractory period.
- stimulus leads to influx of Na+ - depolarisation - depolarising current flows passively down axon - voltage gated Na+ channels further down membrane open - influx of Na+ leads to depolarisation in this region - in the old region, voltage gated Na+ channels close and voltage gated K+ channels open - membrane repolarises and enters refractory period
| Front | How is an action potential propagated along an unmyelinated axon? |
|---|---|
| Back | - stimulus leads to influx of Na+ - depolarisation - depolarising current flows passively down axon - voltage gated Na+ channels further down membrane open - influx of Na+ leads to depolarisation in this region - in the old region, voltage gated Na+ channels close and voltage gated K+ channels open - membrane repolarises and enters refractory period |
Tags: nerves
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