thyroxine
hormone
- Also called:
- 3,5,3′,5′-tetraiodothyronine, or T4
- Related Topics:
- thyroid gland
- thyroid hormone
- aryl halide
- On the Web:
- American Chemical Society - Molecule of the Week Archive - L-Thyroxine (Dec. 04, 2024)
thyroxine, one of the two major hormones secreted by the thyroid gland (the other is triiodothyronine). Thyroxine’s principal function is to stimulate the consumption of oxygen and thus the metabolism of all cells and tissues in the body. Thyroxine is formed by the molecular addition of iodine to the amino acid tyrosine while the latter is bound to the protein thyroglobulin. Excessive secretion of thyroxine in the body is known as hyperthyroidism, and the deficient secretion of it is called hypothyroidism. The chemical structure of thyroxine is