People also viewed. 1  Talk to a doctor live online for free. 2  Pains in both arms and shoulders. 3  Rash on both arms only.  Both arms ache at 1  night. Ask a doctor a question free online.  Ache in both 1  arms. Causes of swollen both 2  arms. Pains in both upper  arms. Both of my 1  arms ache. Both  arms.
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.
Overview. The thyroid gland, located just below the voice box in the front of the neck, is a 2-inch gland with two lobes. The body's metabolism and calcium balance are primarily regulated by the thyroid gland. The T4 and T3 hormones that are secreted by the thyroid stimulate body tissue to produce protein. They also increase the amount of oxygen used by the cells. The calcitonin hormone released in the thyroid regulates calcium levels. The two primary diseases that compromise thyroid function are hypothyroidism, which is an under active thyroid, and hyperthyroidism, an overactive thyroid.