Question

Any substance (usually a chemical) which influences our bodies or emotions

Answer 1

Important Brain Chemicals

Serotonin. You probably already know that serotonin plays a role in sleep and in depression, but this inhibitory chemical also plays a major role in many of your body's essential functions, including appetite, arousal, and mood. ...Dopamine. ...Glutamate. ...Norepinephrine.

Answer 2

serotonin -sleep and depression

dopamin - pleasure

glutamate- excitement

norepinephrine - shock