If a newly developed drug activated receptors for a neurochemical, the drug would be considered a(n) _________ for that neurochemical.

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An agonist is a substance that activates a receptor by mimicking the effect of the neurotransmitter or chemical messenger. In this case, the newly developed drug is activating receptors for a specific neurochemical, indicating that it is working as an agonist for that neurochemical. Antagonists block the effect of neurotransmitters, prototypes are early versions of a drug or treatment, and blockers specifically prevent the binding of a neurotransmitter to its receptors.

If a Newly Developed Drug Activated Receptors for a Neurochemical