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  •  During depolarisation, there isOption: 1 Efflux of <img alt="Cl^{-}" src="https://learn.careers360.com/latex-image/?%5Cinli

 During depolarisation, there is

Option: 1

Efflux of Cl^{-}


Option: 2

Influx of Na^{+}


Option: 3

Influx of K+ K^{+}


Option: 4

Efflux of K^{+}


Answers (1)

best_answer
 

As we have learnt.

When a stimulus (may be mechanical, electrical or chemical) is applied to the membrane of the nerve fibre, its permeability changes and sodium-potassium pump stop operating. Sodium ions rush inside and potassium ions rush outside. This results in the positive charge inside (axoplasm) and negative charge outside (ECF). The stimulus-gated channels are opened by the stimulus and voltage-gated sodium channels are opened by the threshold stimulus. The polarity of the axon membrane that is now conducting the nerve impulse is called the action potential (+30\: mV). Such a membrane is called depolarised.

Hence, the correct answer is option b.

 

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