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Question

During development of action potential in a nerve fibre, positive and negative charges on outer and inner side of axon membrane are reversed due to

A
Excretion of all K+ ions
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B
More K+ ions enter than Na+ ions leave the axon
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C
More Na+ ions enter the axon than K+ ions leave the same
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D
All Na+ ions enter the axon
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Solution

The correct option is C More Na+ ions enter the axon than K+ ions leave the same
C. More Na+ ions enter the axon than K+ ions leave the same
Reason: When a nerve fiber is stimulated at a point, its membrane becomes more permeable to sodium ions at that point. Therefore, 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 get depolarized and the change is termed as the action potential. So the correct option is C.

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