Action Potential -AQA BIOL5

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  • Action potential
    • At resting potential. Na+ channel closed. K+ channel open (some)
      • Energy causes Na+ channel to open, and Na+ diffuse in by electrochemical gradient
        • Potential difference reverse, influx more Na+
          • AP reaches +40mV, Na+ channels close, some K+ channels open
            • More K+ channels open, K+ diffuse out of axon, causing repolarisation
              • Outward diffusion causes hyperpolarisation
                • K+ channels closed, Na-K pumps Na+ out, K+ in.
                  • Resting potential (-65mV) repolarised
    • Energy causes Na+ channel to open, and Na+ diffuse in by electrochemical gradient
      • Potential difference reverse, influx more Na+
        • AP reaches +40mV, Na+ channels close, some K+ channels open
          • More K+ channels open, K+ diffuse out of axon, causing repolarisation
            • Outward diffusion causes hyperpolarisation
              • K+ channels closed, Na-K pumps Na+ out, K+ in.
                • Resting potential (-65mV) repolarised

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