GENERAL HISTOLOGY

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: -Thyroxine (T4) is produced by the thyroid gland under regulation from the hypothalamus and pituitary gland. The feedback loop signals to the hypothalamus in to release thyrotropin-releasing hormone, which then stimulates the pituitary gland to release the thyroid stimulating hormone.

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: -Internally, the gland consists of follicles, which produce thyroxine and triiodothyronine hormones. These hormones contain iodine. About 95 percent of the active thyroid hormone is thyroxine, and most of the remaining 5 percent is triiodothyronine. Both of these require iodine for their synthesis.