2. ACh is found at the neuromuscular junction, in the autonomic nervous system, and within the CNS.

Dopamine is involved with systems controlling movement, reinforcement, and planning. Norepinephrine pathways increase arousal and vigilance.

Serotonin participates in the regulation of mood, appetite, social status, aggression, and sleep. Histamine activity is associated with wakefulness. Glutamate is the most common excitatory neurotransmitter in the CNS. GABA and glycine generally produce inhibition. ATP and its by-products act as neurochemicals. (LO2)