EVERYDAY SCIENCE

Detailed explanation-1: -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-2: -Thyroxine hormone contains iodine. The thyroid gland produces two primary hormones-thyroxine (also referred to as T4) and tri-iodothyronine (also referred to as T3). The numbers 3 and 4 refer to the number of atoms of iodine in the hormones. Iodine is essential for the production of thyroid hormones.

Detailed explanation-3: -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.