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Psychoactive drugs are chemical substances that affect the brain. These medications can affect out central nervous system and change the way we feel, act or percept things. Psychoactive drugs are used as medications, to treat different medical conditions,
Overview of the Autonomic Nervous System: Autonomic Nervous System: Merck Manual Professional An overview of what the Sympathetic and Parasympathetic systems of the Autonomic Nervous System interact within the human body.