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Question

An action potential in the nerve fibre is produced when positive and negative charges on outside and the inside of the axon membrane are reversed because

A
More potassium ions enter the axon as compared to sodium ions leaving it
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B
More sodium ions enter the axon as compared to potassium ions leaving it
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C
All potassium ions leave the axon
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D
All sodium ions enter the axon
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Solution

The correct option is B More sodium ions enter the axon as compared to potassium ions leaving it
When a nerve fibre is stimulated, its membrane becomes more permeable to sodium ions, hence, more sodium ions enter the axon than potassium ions leaving it. As a result, the positive and negative charges on the outside and inside of the membrane are reversed. The membrane with reversed polarity is called depolarised.

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