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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 primary function of your thyroid gland is to secrete thyroid hormones, which are responsible for controlling your bodyâs metabolism. The 2 main thyroid hormones are T3 (triiodothyronine) and T4 (thyroxine).The amount of thyroid hormones secreted is controlled by another hormone, called thyroid stimulating hormone (TSH), which is released from the pituitary gland in your head.he primary function of your thyroid gland is to secrete thyroid hormones, which are responsible for controlling your bodyâs metabolism. The 2 main thyroid hormones are T3 (triiodothyronine) and T4 (thyroxine).