Ace the Dental Hygiene Local Anesthesia Test 2026 – Numb the Nerves, Boost Your Skills!

Epinephrine is a hormone released by the adrenal medulla, which is the inner part of the adrenal glands. When the body encounters stress, these chromaffin cells secrete epinephrine into the bloodstream, producing widespread effects such as a faster heart rate, widened airways, and mobilization of energy. This endocrine release explains why the adrenal gland is the natural source of epinephrine. The other glands listed are responsible for different hormones (pituitary for various trophic hormones, thyroid for thyroxine, pancreas for insulin and glucagon), so they do not produce epinephrine.