- A The membrane becomes permeable to sodium ions
- B The membrane is depolarized
- C There is a slow influx of sodium ions
- D The outer surface of the membrane becomes negatively charged
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Answer:
C
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When a stimulus is applied to a polarized axonal membrane, there is a rapid influx of sodium ions into the membrane, which makes it permeable to sodium ions. This results in depolarization of the membrane, which means that the membrane potential becomes less negative. However, option C states that there is a slow influx of sodium ions, which is incorrect. The correct answer is option C.
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