The naturally occurring compounds that bind to receptors are termed:

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Quizplus · Accepted Answer

The term "neurotransmitters" refers specifically to naturally occurring compounds that bind to receptors. Drugs and pharmaceuticals can also bind to receptors, but they are not naturally occurring. Second messengers are signaling molecules that are produced within cells in response to receptor activation, but they are not the compounds that directly bind to receptors.

The Naturally Occurring Compounds That Bind to Receptors Are Termed