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sensory input and responses (part 3)

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Sensory Input & Responses (Part 3) So how does the axon transmit a signal?  Neuron membrane becomes “ depolarized”  o Na + allowed into cell from outside o Inside cell no longer as negative  Neuron can withstand some depolarization below threshold BUT  If threshold exceeded flood gates open massive Na + influx  The “flood gates” are “voltage gated Na+ channels” in membrane  o if voltage across membrane is too close to zero, they open and Na+ diffuses in  Result  reversal of charge across membrane = “action potential”  

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