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(B) The transmission of a nerve impulse involves the movement of ions ($Na^+$ and $K^+$) across the axonal membrane against their concentration gradie

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Nerve fibre

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(B) The transmission of a nerve impulse involves the movement of ions ($Na^+$ and $K^+$) across the axonal membrane against their concentration gradients. This process is mediated by the $Na^+-K^+$ pump,which is an active transport mechanism. This pump requires $ATP$ (Adenosine Triphosphate) to function. The $ATP$ is generated through cellular respiration occurring within the mitochondria present in the nerve fibre (axon). Therefore,the nerve fibre itself provides the necessary energy for impulse transmission.

The energy required during the transmission of a nerve impulse is provided by:

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