Britannica Sources used in this answer

What is triiodothyronine also called?

Created from Britannica articles using AI. AI can make mistakes, so verify using Britannica articles.

Detailed anatomical illustration of the human thyroid gland and surrounding structures, showing the right and left lobes, isthmus, nearby arteries, veins, nerves, lymph nodes, and cartilage in the neck. — thyroid gland Human thyroid gland.

Triiodothyronine is also commonly referred to as T3. It is an iodine-containing hormone that plays a vital role in the body's biochemistry, acting as the primary biologically active form of thyroid hormone in target tissues.1234