The Neuron
Neurons receive an impulse at the dendrites. This impulse is passed through the axon, a long extension of the cell, in the form of an electrical potential created by differing concentrations of sodium and potassium ions on either side of a membrane in the axon.
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"Complete neuron cell diagram en."
http://en.wikipedia.org/wiki/File:Complete_neuron_cell_diagram_en.svg
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