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The thyroid gland produces the hormones thyroxine, triiodothyronine, and calcitonin. Thyroxine and triiodothyronine are produced by thyroid folliclar cells. Thyroid cells absorb iodine from certain foods and combine the iodine with tyrosine, an amino acid, to make thyroxine (T4) and triiodothyronine (T3).
The thyroid and parathyroid glands are situated close to each other in the front of the neck. The thyroid gland produces the hormone thyroxine (T 4) and its more active form, T 3, which act on body cells to regulate metabolism (the chemical reactions continually occurring in the body).Some thyroid cells secrete the hormone calcitonin, which lowers calcium in the blood.hyroid and parathyroid hormones. Iodine from the diet is used to make the hormones T 4 and T 3. These hormones are produced by the thyroid gland and regulate body metabolism. Parathyroid hormone (PTH) and, to a lesser extent, calcitonin regulate levels of calcium and phosphate.