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Get Answers to all your Questions
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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