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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.

Column-$I$	Column-$II$
$1$. Cell body	$p$. Transmit impulses towards the cell body
$2$. Dendrites	$q$. Transmit impulses away from the cell body
$3$. Synaptic vesicles	$r$. Contain cytoplasm and granular bodies
	$s$. Neurotransmitters

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

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$1$. Cell body $p$. Transmit impulses towards the cell body
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