Q.

Depolarisation of axolemma during nerve conduction takes place because of 

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a

K+ moves inside

b

an equal amount of Na+ and K+ move out across axolemma

c

Na+ moves inside

d

there is more Na+ outside than inside

answer is B.

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Detailed Solution

Rapid influx of Na+ leads to negative charge on the outer surface of the axolemma and positive charge on the the inner side of the axolemma. The reversal in polarity of the neural membrane is referred to as depolarisation of the axolemma.

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Depolarisation of axolemma during nerve conduction takes place because of