propagation of AP
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What does AP do to Na+ channels?
causes voltage-gates sodium channels to open.
increase membrane permeability and hyperpolarise axon
2
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why does sodium diffuse in one direction?
Sodium diffusing backwards has no effect on membrane as its hyperpolarised.
More and more Na+ diffuse in, more AP. —>
3
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Wave of depolarisation
As more and more Na channels open, more Na+ diffuse in and more depolarisation occurs down axon.
4
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positive feedback loop
Na+ depolarisation, causes more Na+ channels to open and more Na+ to diffuse in.
Note 
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