Neurotransmitters are chemical substances that transmit information from one nerve cell to another. Many types of neurotransmitters exist, each kind transmitting a specific type of information that participates in how the body functions.
Acetylcholine: associated with muscle function; also associated with memory: Alzheimer’s Disease is marked by a 90% drop in acetylcholine
Dopamine: associated with attention & learning, & motivation by gratification/reinforcement; Parkinson’s Disease is marked by low dopamine; Schizophrenia is marked by dopamine in excess
Seratonin: plays role in eating behavior, body-weight regulation–excess seratonin results in Anorexia; arousal, mood, impulsivity; blocking seratonin increases aggression; defects in Seratonin production are linked to depression
Gamma-Aminobutryic Acid (GABA): influence in memory & the ability to learn; associated with calming anxiety; depressant/tranquilizer drugs work in conjunction with GABA to produce the effects of excess relaxation
Epinephrine/Norepinephrine: adrenaline/noradrenaline; governs fight-or-flight behavior; caffeine works by interrupting channels that regulate epinephrine, prompting the excessive release of adrenaline