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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.
Follow Following Unfollow Pending Disabled. A American Association of Endocrine Surgeons answered. Thyroid hormone has a number of different effects. Overall, the thyroid can be thought of as controlling the body's metabolism. Thyroid hormone increases the heart rate and how forcefully the heart squeezes. It also affects how fast food moves through your GI tract, bone loss and how fast sugar is made and used up in the body.