甲状腺是人体最大的内分泌腺,重约20—30克,位于气管上端两侧的甲状软骨下方,有丰富的毛细血管网和毛细淋巴网与血管相连。因此,它所分泌的激素可以直接进入血液和淋巴液中。甲状腺分泌的胶状物中,有含有碘的甲状腺素。甲状腺素的主要作用是促进新陈代谢和加速体内物质的氧化分解过程,促进生长发育,提高神经系统的兴奋性。如果食物中缺乏碘,便会使甲状腺素 Thyroid is the largest human endocrine gland, weighing about 20-30 grams, located in the trachea on both sides of the thyroid cartilage below the rich capillaries and capillary network connected with blood vessels. Therefore, it secreted hormones can be directly into the blood and lymph. Thyroid secretion of jelly, iodine-containing thyroxine. Thyroxine's main role is to promote metabolism and accelerate the body's oxidative decomposition process, promote growth and development, improve the nervous system excitability. If there is a lack of iodine in the food, it will make thyroxine