The parasympathetic and sympathetic nervous systems are subdivisions of the autonomic nervous system.

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The parasympathetic and sympathetic nervous systems are both part of the autonomic nervous system, which controls involuntary actions such as heart rate, breathing, and digestion. The two systems have opposing effects on the body's functions, with the parasympathetic system generally promoting rest and relaxation, and the sympathetic system activating the "fight or flight" response.

The Parasympathetic and Sympathetic Nervous Systems Are Subdivisions of the Autonomic