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"Hormones and Neurotransmitters Are Entirely Different Things"

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Treating hormones and neurotransmitters as entirely separate categories overstates a real distinction — some molecules, like norepinephrine, function as both depending how they are released.

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Norepinephrine acts as a neurotransmitter at sympathetic synapses and as a circulating hormone when released by the adrenal medulla.

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This entry states the popular assumption — Bio 2929 gives what distinguishes the two roles.