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The thyroid hormone process begins when the pituitary gland in the brain produces thyroid-stimulating hormone (TSH). TSH then acts upon the thyroid gland to produce thyroid hormones. The two main thyroid hormones produced are thyroxine (T4) and triiodothyronine (T3). Although the thyroid gland produces more T4 (80 percent) compared with T3 (20 percent), T3 is 300 percent more active than T4 and is the thyroid hormone responsible for increasing metabolism. In fact, much of the T4 is converted into the more active T3 inside the cells of the body.
The hormones secreted by the thyroid gland are the triiodothyronine (T3), thyroxine (T4) and the thyrocalcitonin which is responsible for the calcium reabsorption or breakdown. T3 and T4 are the two primary hormones responsible for metabolism. The anterior pituitary gland signals the thyroid gland to secrete hormones.s I have said earlier, the thyroid gland is responsible for the regulation of the metabolism of the body. This means that the thyroid secretes hormones that are responsible for burning the calories, fats and other nutrients used by our body for energy.