NEET Biology question

During the transmission of nerve impulse through a nerve fibre, the potential on the inner side of the plasma membrane has which type of electric charge?

(A)First negative, then positive and again back to negativeCorrect
(B)First positive, then negative and continuing to be negative
(C)First negative, then positive and continuing to be positive
(D)First positive, then negative and again back to positive

Answer: (A)

Solution

The inner surface of the resting axon membrane is negative; upon stimulation, it becomes transiently positive during depolarisation (as Na+ rushes in), and

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Question ID VK-117500