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Reuptake inhibitors differ from both agonists and antagonists because they:

AAct on the transporter rather than the receptor site
BBind to the receptor but never activate that receptor
CIncrease the number of receptors on the dendrite
DDestroy the neurotransmitter left inside the synapse
Answer & Solution
Correct answer: A. Act on the transporter rather than the receptor site
1. Agonists and antagonists both operate by binding to receptor sites. 2. The chapter draws an explicit contrast: reuptake inhibitors instead prevent unused neurotransmitters from being transported back into the neuron. 3. Blocking that transport leaves more neurotransmitter in the synapse for a longer period. 4. Option B describes an antagonist, which binds receptors without activating them, so it names the wrong mechanism. _Source: OpenStax Psychology (1st ed., CC BY 4.0), Ch 3 "Biopsychology", §3.2 Cells of the Nervous System_
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