Dr.Arthur and his colleagues are investigating a new drug for depression that stimulates serotonin receptors.Dr.Arthur is most likely investigating which kind of drug?

Question

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Dr. Arthur is investigating a drug that stimulates serotonin receptors, which suggests that it is an agonist (a drug that enhances a neurotransmitter's activity) rather than an antagonist (a drug that inhibits a neurotransmitter's activity), a second messenger (a signaling molecule activated by neurotransmitters), or a synaptic blocker (a drug that prevents neurotransmitter release).

DrArthur and His Colleagues Are Investigating a New Drug for Depression