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

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