ZoologyDuring an action potential, repolarisation of the axonal membrane occurs due to the

During an action potential, repolarisation of the axonal membrane occurs due to the

  1. A

    influx of Na+

  2. B

    influx of K+

  3. C

    efflux of Na+

  4. D

    efflux of K+

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    Solution:

    When a resting axonal membrane is stimulated, voltage-gated Na+ channels open. The influx of Na+ causes depolarisation (inner side becomes positively charged). It is quickly followed by a rise in permeability to K+ due to the opening of voltage-gated K+ channels. Efflux of K+ causes repolarisation of the axonal membrane (inner side again becomes negatively charged).

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