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(D) The generation and conduction of a nerve impulse involve a sequence of electrochemical changes across the neuronal membrane.$1$. When a stimulus i

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Depolarisation and repolarisation

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(D) The generation and conduction of a nerve impulse involve a sequence of electrochemical changes across the neuronal membrane.$1$. When a stimulus is received,the membrane undergoes $Depolarisation$ due to the influx of $Na^+$ ions.$2$. This is immediately followed by $Repolarisation$ due to the efflux of $K^+$ ions to restore the resting membrane potential.$3$. Therefore,a nerve impulse is a self-propagating wave consisting of both $Depolarisation$ and $Repolarisation$ processes.

For visual sense,the nerve impulse is generated by

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