Opioid addiction, or opioid use disorder (OUD), is a major global health issue, and recovery from OUD is marked with high ...

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.

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 produces our fight-or-flight response to any perceived threat. The vagus nerves are part of the parasympathetic nervous system, which does the opposite. Tiny ...