The signs seen in a hypoglycemic patient are primarily due to which physiological mechanism?

• A. Sympathetic nervous system activation
• B. Chemoreceptor stimulation
• C. Anaerobic metabolism
• D. RAS hypoglycemia

Answer: (A)

Low blood sugar triggers a rapid sympathetic fight-or-flight response. As glucose falls, the body releases catecholamines (epinephrine and norepinephrine) and activates sympathetic nerves to raise glucose availability and protect brain function. This adrenergic surge produces the classic signs: sweating, tremor, palpitations, anxiety, and hunger. Other options don’t explain these hands-on symptoms: chemoreceptor stimulation relates to detecting changes in oxygen, carbon dioxide, and pH rather than glucose; anaerobic metabolism describes cells lacking oxygen, not the systemic adrenergic signs; and the renin-angiotensin system regulates blood pressure and volume rather than the immediate neural response to hypoglycemia.