triiodothyronine

hormones include thyroxine and triiodothyronine, which regulate tissue metabolism. Natural desiccated thyroid produced from beef and pork and the synthetic derivatives levothyroxine and liothyronine are used in replacement therapy to treat hypothyroidism that results from any cause.

two thyroid hormones, thyroxine and triiodothyronine, with the former being produced in much greater quantities than the latter. Thyroid hormones exist in two forms, one of which is bound to several proteins, and the other of which, a very small amount, is free. Thus, serum thyroxine can be measured as…

… (T₄) may be converted to triiodothyronine (T₃), a change that substantially increases its hormonal potency, or it may be converted to reverse triiodothyronine (reverse T₃), a molecule with the same three iodine atoms that has minimal biological activity.

…thyroid hormones thyroxine (T₄) and triiodothyronine (T₃). The hormones are then released, passing from the cells into the circulation.

-triiodothyronine, are formed by the addition of iodine to an amino acid (tyrosine) component of a glycoprotein called thyroglobulin. Thyroglobulin is stored within the gland in follicles as the main component of a substance called the thyroid colloid. This arrangement, which provides a reserve of…