Generation of an Action Potential

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Generation of an Action Potential

Action Potential:

  • Occurs when neurone is stimulated (recieves nerve impulse from another neurone)
  • Is a reversal of potential difference across the neurone membrane (inside becomes positive)
  • It self-propagates and travels along the neurone (node to adjacent node)
  • Resting Potential -
    • sodium ion/potassium ion pump maintains a resting potential of -70mV
  • Depolarisation - 
    • gated (closed) sodium ion channel proteins open
    • action potential - neurone is stimulated
    • gated potassium ion channel proteins remain closed
    • rapid diffusion of sodium ions into axon
    • raising membrane potential to +40mV
    • action potential then self-propagate and travels
      • due

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