| Answer | Crossword Clue |
|---|---|
| serotonin | a compound occurring in the brain, acting as a neurotransmitter |
| serotonins | SEROTONIN, a compound occurring in the brain, acting as a neurotransmitter |
| dopamine | catecholamine neurotransmitter in the central nervous system, retina, and sympathetic ganglia, acting within the brain to help regulate movement and emotion: its depletion may cause Parkinson's disease |
| acetylcholine | A compound that occurs throughout the nervous system, in which it functions as a neurotransmitter |
| serotonin | A compound present in blood platelets and serum that constricts the blood vessels and acts as a neurotransmitter |
| serotonins | A compound present in blood platelets and serum that constricts the blood vessels and acts as a neurotransmitter |
