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Thyroid gland (thyroid, Latin glandula thyreoidea), endocrine gland, located at the front door, below the larynx
butterfly shape, resembling a letter H with a depleted front part, isthmus, which lies in front of the trachea, and two lobes, which lie lateral to the trachea and the larynx. Thyroid gland is difficult thirty grams. The main thyroid hormones are-thyroxine (T4) and triiodothyronine (T3). Under the supervision of tireotropnog hormone (TSH) and hypothalamic thyroid gland secretes the hormone thyroxine (T4) with autoregulaciju, so that secretion is activated as soon as the reduced levels of this hormone in the blood. T3 and T4 regulate the intensity of metabolism in the body. When lack of hormone basal metabolism decreases 40%. With these two hormones and the thyroid gland secretes calcitonin, a hormone involved in regulating the concentration of calcium ions in body fluids. For the synthesis of thyroid hormones requires iodine. Iodine get the most out of food. A sufficient amount of iodine is about 50 mg per year. If the thyroid gland secretes too little hormone, inhibition of the pituitary and the hypothalamus will be reduced, and will stimulate thyroid gland to increase. That is, for example, occurs in cases where the cause of goitre of iodine deficiency in food. In such circumstances the thyroid gland can not produce sufficient amounts of hormones and the pituitary secretes more TSH, and thyroid gland tissue is significantly increased.