T3 & T4 Thyroid hormones question?
Do the numbers 3 and 4 come from the number of iodine atoms the have in their molecules?
User Comments
- yes , the 3 and 4 come from the number of iodine atoms.
Triiodothyronine, C15H12I3NO4, also known as T3, is a thyroid hormone.
Thyroxine, or 3:5,3':5' tetraiodothyronine (often abbreviated as T4) is the major hormone secreted by the follicular cells of the thyroid gland. C15H11I4NO4
see 3 and 4
there is not such hormone as T2
- Also is T2 produced in the Thyroid and is it an active hormone?
- The number after the "T" letter, mean the number of iodine atoms in the molecule...So, T3, turns out to be triiodothhyronine, and T4 is thyroxine proper....
The most active of the two, and faster to act, biologically speaking is T3 or triodothyronine....
Both hormones are secreted by the thyroid gland, speed of the syntheses, influenced by negative feedback of a circulating hormone TSH or thyrostimulant hormone, produced in the hypothalamus, and secreted by the anterior hypophysis..in the base of the brain.
Now, the synthesis of both T3 and T4, is carried by bonding to units of iodated meththylphenol, by a bridging atom of oxygen, joining two units...if it unites one bi iodinated with other bi iodinated unit, then T4 or thyroxine will result from the synthesis,,,,id asymmetrical units are joined (one diiodinated and other monoiodinated) T3 will turn out to appear....However, in the thyroid, another less potent compound (in minute quantities) are produced, like T1 and T2, which are of no physiological meaning, other than precursor or "incomplete forms" or by products, of T3 and T4 with only an infinitesimal fraction of potency as compared with the fully iodinated hormone.,,
- licensed surgeon