[An animal source of thyroid used as hormonal replacement therapy. Thyroid extract or desiccated thyroid contains both levothyroxine (thyroxine or T4) and liothyronine (triiodothyronine or T3). Levothyroxine is deiodinated in the peripheral tissues to produce increased levels of the active form, liothyronine (T3). Thyroid hormones play an important role in the regulation of cellular respiration, thermogenesis, cellular growth and differentiation as well as regulating the metabolism of proteins, carbohydrates and lipids. ( NCI )]
UMLS (NCI) C0221331 - Pharmacologic Substance
- Biologically Active Substance