Question: is triiodothyronine endocrine or exocrine?
Answer: Thyroid Gland This is one of the largest endocrine glands in the body. It is positioned on the neck just below the larynx and has two lobes, one on either side of the trachea. It is involved in the production of the hormones T3 (triiodothyronine) and T4 (thyroxine).