Ace the Certified Emergency Nurse (CEN) Challenge 2026 – Energize Your Nursing Future!

The symptom associated with sympathetic nervous system activation is an increased heart rate. When the sympathetic nervous system is stimulated, it triggers the body's "fight or flight" response, which prepares the body to respond to stress or danger. This response includes several physiological changes aimed at enhancing physical performance and increasing alertness.

One of the key effects of this activation is an increase in heart rate, achieved through the release of catecholamines like adrenaline. This increase in heart rate allows for more blood to be pumped throughout the body, ensuring that vital organs and muscles receive adequate oxygen and nutrients to function optimally during stressful situations.

In contrast, vasodilation, decreased respiratory rate, and bronchoconstriction do not align with sympathetic activation. Vasodilation is more associated with the parasympathetic nervous response, which promotes relaxation and a state of calm. Decreased respiratory rate also falls under parasympathetic activity, as it encourages a more restful state. Bronchoconstriction generally leads to reduced airflow to the lungs, which is counterproductive during a sympathetic response that promotes increased oxygen intake for heightened energy levels and performance.