Why impulse is unidirectional
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In a nutshell, a nerve firing results in a chain reaction down the nerve cell's axon, or stemlike section. ... Therefore, nerve impulses cannot travel in the opposite direction, because nerve cells only have neurotransmitter storage vesicles going one way, and receptors in one place
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Neurotransmitters are molecules that fit like a lock and key into a specific receptor. ... Therefore, nerve impulses cannot travel in the opposite direction, because nerve cells only have neurotransmitter storage vesicles going one way, and receptors in one place.
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