ANATOMY

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: -Once your thyroid releases thyroxine (T4) into your bloodstream, certain cells in your body transform it into triiodothyronine (T3) through a process called de-iodination. This is because cells that have receptors that receive the effect of thyroid hormone are better able to use T3 than T4.

Detailed explanation-3: -Thyroxine, an iodine-containing hormone, is secreted by the thyroid gland. It increases the rate of cell metabolism and regulates growth. Thyroxine can also be made synthetically for treatment of hypothyroidism.

Detailed explanation-4: -Thyroxine, also known as T4, is a type of thyroid hormone. A T4 test measures the level of T4 in your blood. Too much or too little T4 can be a sign of thyroid disease.

Detailed explanation-5: -Thyroid hormones: T3 and T4. The follicular cells of the thyroid produce two iodine-containing hormones, called T3 and T4 (also known as thyroxine). Each molecule of T3 (triiodothyronine) has three atoms of iodine, while each molecule of T4 (tetraiodothyronine) has four iodine atoms.