Reference Terms
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Parasympathetic nervous system

The parasympathetic nervous system is one of three divisions of the autonomic nervous system.

Sometimes called the rest and digest system, the parasympathetic system conserves energy as it slows the heart rate, increases intestinal and gland activity, and relaxes sphincter muscles in the gastrointestinal tract.

Note:   The above text is excerpted from the Wikipedia article "Parasympathetic nervous system", which has been released under the GNU Free Documentation License.
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