NEET 2000 Biology question

Depolarization of axolema during nerve conduction takes place because of :

(1)Equal amount of Na & K move out across axolema
(2)Na move inside and K move more out sideCorrect
(3)More Na outside
(4)None

Answer: (2)

Solution

At rest the axolemma is polarised (outside positive, inside negative) because of a high Na concentration outside and K inside, with K leak channels more permeable. When the nerve is stimulated, voltage-gated Na channels open and Na rushes into the axon (inside becomes positive: depolarisation);

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Question ID VK-088675