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and then I pass that on this way,
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because I'm now standing at the site
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where there's a huge disturbance in membrane potential
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and that's going to cause some current to flow,
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a little bit to flow downstream.
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That little bit that flows downstream is going to cause
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the voltage-gated channels here to open,
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and an action potential to be generated at this site.
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If you follow that line of thinking,
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then an initial disturbance over here
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creates a massive membrane potential here,
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which moves to here, which moves to here, which moves to here,