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Question

During the transmission of nerve impulse through a nerve fibre, the potential on the inner side of the plasma membrane has the following electrical change


  1. First negative, then positive and again back to negative

  2. First positive, then negative and again back to positive

  3. First ngative, then positive and continue to be positive

  4. First positive, then negative and continue to be negative


Solution

The correct option is A

First negative, then positive and again back to negative


The transmission of a nerve impulse along a neuron from one end to the other occurs as a result of electrical changes across the membrane of the neuron. The membrane of an unstimulated neuron is polarized—that is, there is a difference in electrical charge between the outside and inside of the membrane.

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