Parasympathetic Nervous System
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The parasympathetic nervous system produces "rest and digest" responses, slowing heart rate and stimulating digestion, resetting organ function after sympathetic activation subsides.
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Acetylcholine released by parasympathetic postganglionic neurons slows heart rate and stimulates digestive activity.
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Sympathetic and parasympathetic systems are typically antagonistic on the same organs, not independent, unrelated controls.