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  • Explain the following processes: (b) Depolarisation of the membrane of a nerve fibre

Q3.    Explain the following processes:

         (b) Depolarisation of the membrane of a nerve fibre

Answers (1)

  • When the nerve fibre is stimulated, it is said to be in the depolarised state.
  • In a depolarised state, the membrane of the nerve fibre experiences an action potential.
  • The following steps take place during the process of depolarisation of the membrane of a nerve fibre:
    • In a polarised state, the axon has more concentration of K+ ions and outside the axon, the concentration of Na+ ions is more.
    • When the nerve fibre gets excited by the stimulus, the permeability of the membrane for Na+ ions and K+ ions is reversed.
    • The membrane becomes highly permeable for Na+ ions.
    • There is a rapid influx of Na+ ions into the axon.
    • This make the inner side of the membrane positively charged and the outside of the membrane becomes negatively charged.
    • This results in depolarisation of the membrane of the nerve fibre and its experiences an action potential. 
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Priyanka Kumari

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