Which nervous system division is most active during stress and danger?

• A. Autonomic nervous system
• B. Sympathetic
• C. Parasympathetic
• D. Somatic nervous system

Answer: (B)

When stress and danger arise, the body triggers the fight-or-flight response, driven mainly by the sympathetic division of the autonomic nervous system. This branch accelerates the heart and strengthens its contractions, opens the airways, dilates pupils, redirects blood to muscles, increases glucose availability, and suppresses nonessential functions like digestion. All of these changes prepare you to act quickly. The parasympathetic division promotes rest and digestion and would dampen these responses, so it isn’t the primary activator in a dangerous situation. The somatic nervous system controls voluntary muscle movements and isn’t responsible for these automatic, stress-related changes. So the sympathetic division is the one most active during stress and danger.