Respuesta :

The branch of the autonomic nervous system for the "fight or flight" response is the sympathetic nervous system. The main function of the sympathetic nervous system in the "fight or flight" response is that it stimulates the adrenal medulla to produce cathecolamines such as epinephrine and norepinephrine. The sympathetic nervous system also acts to increase heart rate and respiratory rate to prepare the body to a stressful situation. The sympathetic nervous system also inhibits the activity of the gastrointestinal and urinary tracts.
Sympathetic   nervous  system   is the  branch  of outonomic  nervous  system  which  begins  to energize  the body  for the   "fight  or flight " syndrome.

   The  sympathetic  nervous  system (SNA)   play an important role in regulating the body's unconscious action. The primary process  of  sympathetic  nervous system  is to stimulate   the body  fight or  flight   response.  For example  the  sympathetic  nervous  system  can  accelerate  heart rate,  widen  bronchial  passage  among  others