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Which of these does not take place when a stimulus is applied to a polarized axonal membrane?(a) It becomes permeable to sodium ions(b) The membrane is depolarized(c) There is a slow influx of sodium ions(d) Outer surface of the membrane becomes negatively chargedThis question was addressed to me by my school teacher while I was bunking the class.Question is taken from Neuron-2 in division Neural Control and Coordination of Biology – Class 11

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Correct answer is (c) There is a slow influx of sodium ions

Explanation: When a stimulus is applied to a POLARIZED axonal membrane, the polarity of the membrane is reversed. It becomes PERMEABLE to sodium ions and LEADS to its RAPID influx. Outer SURFACE of the membrane becomes negatively charged.



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