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

Monjur Alahi

An action potential in the nerve fibre is produced when positive and negative charges on the 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
B. more sodium ions enter the axon as compared to potassium ions leaving it
C. all potassium ions leave the axon
D. all sodium ions enter the axon


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Salim Ahmed Kawsar

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Correct Answer - B
When a nerve fibre is stimulated, its membrable to sodium ions. Hence, more sodium ions entre 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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