The interior of a neuron that is carrying a nerve impulse has more sodium ions in it than the interior of a neuron that is not carrying a nerve impulse.

Name: The interior of a neuron that is carrying a nerve impulse has more sodium ions in it than the interior of a neuron that is not carrying a nerve impulse.
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During a nerve impulse, sodium ions rush into the neuron, causing the interior to become more positively charged. This difference in ion concentration helps propagate the impulse along the axon.

The Interior of a Neuron That Is Carrying a Nerve