What are T3, T4, and TSH? - EndocrineWeb
www.endocrineweb.com › thyroid-what-are-t3-t4-tshApr 22, 2020 · Without TSH, the system would fail. Thyroxine (T4) is responsible for your metabolism, mood, and body temperature, among other things. T3, too, is made in the thyroid gland, and it can also be made in other tissues within the body by converting T4 (in a process called deiodination) into T3.