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Question

When a stimulus is applied at a site on the polarised membrane:

A
Na+ moves out of axoplasm
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B
Na+ moves into axoplasm
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C
K+ moves into axoplasm
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D
Ca2+ moves into axoplasm
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Solution

The correct option is B Na+ moves into axoplasm
When a stimulus is applied at a site on the polarised membrane, the membrane at the site becomes freely permeable to Na+. This leads to opening of Na+ channels and results in a rapid influx of Na+ into the axoplasm followed by the reversal of the polarity at that site called a depolarized state.

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