MEDICAL PHYSIOLOGY

Detailed explanation-1: -The DIT and monoiodotyrosine molecules form covalent bonds with one another to constitute the active forms of thyroid hormone tetraiodothyronine or thyroxine (T4), formed by two DITs and carrying four iodine molecules) and triiodothyronine (T3), formed by a DIT and monoiodotyrosine and carrying three iodine molecules).

Detailed explanation-2: -T4 is a thyroid hormone made up of four iodine molecules, which is why it is abbreviated as T4. It contains two linked tyrosine amino acids. The majority of thyroid hormone released is in the form of inactive T4.

Detailed explanation-3: -Thyroxine is produced by attaching iodine atoms to the ring structures of this protein’s tyrosine residues; thyroxine (T4) contains four iodine atoms, while triiodothyronine (T3), otherwise identical to T4, has one less iodine atom per molecule.

Detailed explanation-4: -Your body controls your thyroid hormone (T3 and T4) levels through a complex feedback loop. Your hypothalamus releases thyrotropin-releasing hormone (TRH), which triggers your pituitary gland to release thyroid-stimulating hormone (TSH), which stimulates your thyroid to release T3 and T4.

Detailed explanation-5: -Triiodothyronine, also known as T3. Tetraiodothyronine, also called thyroxine or T4. Calcitonin. 17-Nov-2010