Neural Control And Coordination

Depolarization of axolemma during nerve conduction takes place because _____.
A. Equal amount of Na+ and K+ move across the axolemma
B. Na+ ions move inside
C. More Na+ ions outside
D. More K+ ions outside

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Answer: Option B
: B

Depolarization of a nerve cell membrane occurs during the passage of an action potential along the axon where the nerve is transmitting an impulse. During depolarization, the Voltage-gated Na+ channels open, and Na+ rush into the axon. Entry of sodium ions leads to depolarization (reversal of polarity) of the nerve membrane. This membrane depolarization causes the opening of voltage-gated K+channels, allowing K+ions to exit and repolarization of the membrane.

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