The naturally occurring compounds that bind to receptors are termed:

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Naturally occurring compounds that bind to receptors are called transmitters, which include molecules such as neurotransmitters and hormones. Drugs are synthetic or artificially created compounds that imitate or antagonize the effects of these natural compounds, while pharmaceuticals generally refer to drugs used for medical purposes. Second messengers are intracellular signaling molecules that are produced in response to the activation of cell surface receptors, and are not necessarily naturally occurring compounds that directly bind to receptors.

The Naturally Occurring Compounds That Bind to Receptors Are Termed