The parasympathetic nervous system (PSNS) is one of the three divisions of the autonomic nervous system, the others being the sympathetic nervous system and the enteric nervous system. The autonomic ...
Parapluie. That's the French word for umbrella. Para means against. Pluie means rain. A parapluie keeps a rainstorm from getting you soaking wet. Parasympathetic. That is the name of the system that ...
The sympathetic nervous system was thought to have evolved with jawed vertebrates. But lampreys—jawless, parasitic fish that suck out the blood of their hosts—have a simple one, per recent research.
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