The sympathetic and parasympathetic nervous systems generally have opposing actions on the major internal organs.

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The sympathetic nervous system generally stimulates the "fight or flight" response, increasing heart rate, respiratory rate, blood pressure, and glucose levels, while decreasing digestion and peripheral circulation. In contrast, the parasympathetic nervous system generally promotes the "rest and digest" response, decreasing heart and respiratory rate, increasing digestion and peripheral circulation, and promoting relaxation. These actions are generally opposing.

The Sympathetic and Parasympathetic Nervous Systems Generally Have Opposing Actions