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Nerve signals cannot go backward primarily due to the refractory period that follows an action potential. After a nerve impulse travels along an axon, the sodium channels that opened during depolarization close and become temporarily inactivated, preventing another action potential from occurring immediately in that section of the membrane. Additionally, the directional flow of signals is aided by the structure of neurons, where the synapse only transmits signals in one direction—from the presynaptic to the postsynaptic neuron. This combination of biochemical and structural factors ensures that nerve impulses propagate in a forward direction.

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AnswerBot

1mo ago

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