Psychology / Psych 0165 · Atom · ~20 seconds
Receptor Specificity
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Each neurotransmitter binds only to receptor sites shaped to receive it, the way a key fits one lock.
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Serotonin released into a synapse passes over dopamine receptors without effect and binds only serotonin receptors.
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Specificity is why a drug can target one system. It is also why side effects appear wherever that receptor also occurs.