1　碘的生理意义、来源和代谢1 1　碘是人体微量元素 ,是制造甲状腺激素的主要原料。碘是甲状腺激素的必需成分 ,分别占Ｔ4 和Ｔ3分子质量的 65%和 59% ,甲状腺激素通过相应受体选择调节靶器官的基因表达 ,它对脑发育、肝脏、垂体、肌肉的作用尤为重要。甲状腺激素对机体的生命 1, the physiological significance of iodine, sources and metabolism 1 1 iodine is a trace element of the human body, is the main raw material for the production of thyroid hormones. Iodine is an essential component of thyroid hormones, accounting for 65% and 59% of the mass of T4 and T3, respectively. Thyroid hormones regulate gene expression in target organs through the selection of corresponding receptors and are particularly important for brain development, liver, pituitary and muscle function . Thyroid hormone on the body’s life