Thyroxine production: follicular epithelial cells absorb amino acids in blood, synthesize thyroglobulin precursors in rough endoplasmic reticulum, and then add sugar to Golgi complex, concentrate to form secretory granules, which are discharged into follicular cavity for storage through exocytosis.

Metabolism of thyroxine: T3 and T4 are released into the blood at the bottom of cells.

Excessive use can lead to hyperthyroidism, angina pectoris, myocardial infarction and heart disease in the elderly. Propranolol can counteract its effect. Osteoporosis, increased calcium and phosphorus excretion, decreased neuromuscular excitability. Thyroid hormone is synthesized, stored and released by the thyroid gland. The raw materials for synthesizing thyroid hormone are iodine and tyrosine in the body.

Extended data:

Physiological effects of thyroxine:

1, which promotes the metabolism of substances and energy in the body, mainly promotes the oxidative decomposition of energy substances such as carbohydrates, protein and fat in the body, thus increasing oxygen consumption and releasing energy.

2, promote physical and intellectual development, and have a significant impact on bones, nervous system and reproductive system.

3. Improve the excitability of the nervous system, especially the sympathetic nervous system.

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