What is a parasympathetic nervous system?

What is a parasympathetic nervous system? Here are some definitions.

Noun
  1. (neuroanatomy) One of the divisions of the autonomic nervous system, based between the brain and the spinal cord, that slows the heart and relaxes muscles.
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Examples
The medicine that supports all aspects of the parasympathetic nervous system is a medicine from the strophanthus plant called ouabain, or g-strophanthin.
The constrictor muscle is supplied by the parasympathetic nervous system, and the dilator by the sympathetic nervous system.
Further, he conceptualized the sympathetic nervous system in its role as accelerator and the parasympathetic nervous system as brake.
Unlike a fear, disgust responses involve activation of the parasympathetic nervous system.
This 10-second delay is more in keeping with the behavior of the sympathetic than the parasympathetic nervous system.
The autonomic nervous system is divided into two more systems: the sympathetic nervous system and the parasympathetic nervous system.

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