How is action potential generated?

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  • How is an action potential generated?
    • 1) Stimulus causes a change in the potential difference between the inside and outside of the axon
    • 2) Stimulus arriving on an axon causes the Na+ ions to flood/diffuse into the axon.
    • 3) There is now a higher concentration of Na+ inside the axon compared to the outside the axon.
    • 4) They are NOT pumped in - there is no active transport, they diffuse from a higher concentration outside, to a lower concentration inside.
    • 5) The potential difference in charge between inside and outside of the axon membrane is now +40mV - threshold has been reduced
    • 6) K+ ions channels close
    • 7) sodium-potassium pump stops = depolarised (positive charge inside axon)

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