| NOUN | substance | neurochemical | any organic substance that occurs in neural activity |
|---|
| Meaning | Any organic substance that occurs in neural activity. | |
|---|---|---|
| Narrower | endorphin | A neurochemical occurring naturally in the brain and having analgesic properties |
| neurotransmitter | A neurochemical that transmits nerve impulses across a synapse | |
| Broader | organic compound | Any compound of carbon and another element or a radical |
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