what is triiodothyronine
What is triiodothyronine? Triiodothyronine is the active form of the thyroid hormone, thyroxine. Approximately 20% of triiodothyronine is secreted into the bloodstream directly by the thyroid gland. The remaining 80% is produced from conversion of thyroxine by organs such as the liver and kidneys.rint | Email article to a friend | Last updated: January 11, 2015. Triiodothyronine is a thyroid hormone that plays vital roles in the bodyâs metabolic rate, heart and digestive functions, muscle control, brain development and the maintenance of bones. Alternative names for triiodothyronine T3.