Multiple choice

When the action potential begins, the sodium gates open, allowing Na+ to cross the membrane. Now the polarity changes to

  1. Negative outside and positive inside

  2. Positive outside and negative inside

  3. There is no difference in change between outside and inside

  4. None of the above
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A Correct answer
Explanation

During depolarization, sodium channels open and Na+ ions rush into the cell. This influx makes the interior of the cell more positive relative to the exterior, which remains negative.

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