Certified Emergency Nurse (CEN) Test 2025 – 400 Free Practice Questions to Pass the Exam

The primary function of the sympathetic nervous system is to stimulate fight or flight responses. This system is part of the autonomic nervous system and responds to perceived threats or stressful situations by preparing the body to either confront or flee from danger. When activated, the sympathetic nervous system increases heart rate, dilates bronchial passages, inhibits digestion, and redirects blood flow to essential organs and muscles, maximizing physical performance and alertness.

Other functions such as promoting rest and digestion are associated with the parasympathetic nervous system, which works in opposition to the sympathetic system. Additionally, while the sympathetic system does influence smooth muscle contraction and blood glucose levels, these are secondary effects to its main role of triggering immediate responses to stressors. In summary, the fight or flight response is a crucial survival adaptation, reflecting the primary role of the sympathetic nervous system.