Chemicals that may be released from neurons or from endocrine glands and that affect the functioning of neurotransmitters are known as

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Chemicals that affect the function of neurotransmitters, but are not neurotransmitters themselves, are known as neuromodulators. They can be released from neurons or endocrine glands and can modify the activity of neurotransmitters. Adrenotransmitters, reuptake inhibitors, and reuptake facilitators are not terms used to describe these chemicals.

Chemicals That May Be Released from Neurons or from Endocrine