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Question

Depolarisation of nerve cell involves

A
Influx of K+
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B
Influx of Na+
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C
Influx of Ca2+ and Cl
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D
Efflux of Na2+
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E
Efflux of Ca2+ and Cl
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Solution

The correct option is A Influx of Na+
B. Influx of Na+
Reason: When the membrane of the neuron is at rest, the higher concentration of Na+ ions keeps the outer environment more positive than the inner environment and the polarization remains intact. When the neuron gets stimulated, the Na+ infflux channels opened and Na+ ions started to enter across the membrane and depolarization occurs. So the correct option is B.

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