What it means
In physiology, SNS usually means the sympathetic nervous system, the branch of the autonomic nervous systemaw-tuh-NOM-ik NUR-vus SIS-tumThe part of the nervous system that controls body functions without conscious thought, such as heart rate, breathing and digestion.auto- selfnom/o law, control-ic relating toFull entry that drives the "fight or flight" response: faster heart, higher blood pressure, wider pupils. It can also mean the somatic nervous system (which controls voluntary muscles) and, in emergency planning, the US Strategic National Stockpile of drugs and supplies. Read it in context.
Related terms
autonomic nervous system
The part of the nervous system that controls body functions without conscious thought, such as heart rate, breathing and digestion.
peripheral nervous system
All the nerves outside the brain and spinal cord, which link them to the rest of the body.