ZoologySoon after a stimulus is applied at a site on the polarised axonal membrane, which of the following occurs?

Soon after a stimulus is applied at a site on the polarised axonal membrane, which of the following occurs?

  1. A

    The membrane’s permeability to Na+ increases

  2. B

    The membrane’s permeability to Na+ decreases

  3. C

    The membrane’s permeability to K+ increases

  4. D

    The membrane’s permeability to K+ decreases

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    Solution:

    When a stimulus is applied at a site on the polarised membrane, the membrane at the site A becomes freely permeable to Na+. This leads to a rapid influx of Na+ causing depolarisation.

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