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Sodium Neurone Stimulus Membrane Ion Action Potential Formation

A stimulus excites the neuron membrane, opening sodium channels, increasing sodium influx and making the interior less negative.

A stimulus excites the neuron membrane, opening sodium ion channels and increasing permeability to sodium, which diffuses in, making the inside less negative.

Front Stimulus (action potential formation)
Back Stimulus excites neurone cell membrane

Sodium ion channels open

membrane more permeable to sodium

sodium ions diffuse into neurone down sodium ion electrochemical gradient 

Inside of neurone less negative

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