Re: what does T3 T4 and TSH do in the body
The thyroid releases several hormones, the main ones are T4, or thyroxine, and T3, or triiodothyronine. T4 is a storage hormone that converts to T3, which is the active thyroid thyroid hormone that enters the cells to maintain metabolic function. T4 converts to T3 when an enzyme removes one of its iodine molecules and this happens mainly in the liver.
TSH is thyroid stimulating hormone, which the pituitary releases when it senses that there is a need for more thyroid hormones. When thyroid hormones levels are high in the body the TSH levels will be low and vise-versa.