Neurotransmitters are chemicals that transmit signals between neurons or from neurons to other cells. They interact with specific receptors found in the brain of humans and animals, controlling a variety of biological processes, e.g. fear, anger, pleasure, memory, energy, appetite and sleep. Today, scientists know various types of neurotransmitter systems: dopamine, norepinephrine, serotonin, histamine, glutamate, and many others. A large number of clinically used drugs for many brain disorders is based on the action on these systems.
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