Where is epinephrine produced in the body?

Where is epinephrine produced in the body?

• A. Adrenal medulla
• B. Pituitary
• C. Thyroid
• D. Sympathetic ganglia

Answer: (A)

Epinephrine is produced in the adrenal medulla, the inner part of the adrenal gland. Its chromaffin cells are specialized neurons that release catecholamines into the bloodstream in response to sympathetic stimulation. About most of what’s released is epinephrine, with a smaller portion being norepinephrine. The adrenal medulla is activated by preganglionic sympathetic nerves that release acetylcholine to trigger this release, making epinephrine a circulating hormone essential for systemic fight-or-flight responses. The other options aren’t sites of epinephrine production: the pituitary and thyroid secrete other hormones, and sympathetic ganglia contain neurons that mainly release norepinephrine locally rather than epinephrine into the blood.

Epinephrine is produced in the adrenal medulla, the inner part of the adrenal gland. Its chromaffin cells are specialized neurons that release catecholamines into the bloodstream in response to sympathetic stimulation. About most of what’s released is epinephrine, with a smaller portion being norepinephrine. The adrenal medulla is activated by preganglionic sympathetic nerves that release acetylcholine to trigger this release, making epinephrine a circulating hormone essential for systemic fight-or-flight responses. The other options aren’t sites of epinephrine production: the pituitary and thyroid secrete other hormones, and sympathetic ganglia contain neurons that mainly release norepinephrine locally rather than epinephrine into the blood.