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The sympathetic and parasympathetic fibers serve the same organs. how can their opposing effects be explained?

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Sympathetic and parasympathetic fibers serve the same organs, but they have opposite effects. The sympathetic system prepares the body for intense activity and fight or flight. The parasympathetic system relaxes the body, controls homeostasis and resting and digesting. It is the feed and breed system. 
User Keegan Jay
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