triiodothyronine (T3)
T3 is another word for the hormone triiodothyronine which is produced by the thyroid gland
Another name for growth hormone is somatotropin.
The release of T3 and T4 from the thyroid resulting from changes in TSH level is an example of a Negative feedback system.
There are two hormones, T3 and T4
triiodothyronine
T3 is triiodothyronine, and is the active form of the hormone secreted by the thyroid. T4 (thyroxine) is another form of thyroid hormone which must be converted to T3 by your body via the deiodinase enzyme. Although T3 is active, your body produces much more T4. The best way to monitor low thyroid function is by looking at TSH (thyroid stimulating hormone). TSH will be high if the thyroid is not producing enough T3/T4. For the majority of hypothyroid cases, only TSH needs to be monitored. For hyperthyroidism and some hard to treat hypothyroid cases, the doctor will test T3 and T4.
Upon stimulation by thethyroid-stimulating hormone (TSH), the follicular cells reabsorb Tg and cleave the iodinated tyrosines from Tg in lysosomes, forming T4 and T3(in T3, one iodine atom is absent compared to T4), and releasing them into the blood
The hormone that regulates the synthesis and secretion of T3 (Triiodothyronine) and T4 (Thyroxine) by the thyroid gland is thyroid stimulating hormone (TSH) that is produced and secreted by the anterior pituitary gland, also known as the adenohypophysis.
T3 and T4 hormones regulate the metabolism, protein synthesis and sensitivity to other hormones in the body.
TSH is the hormone produced by the pituitary gland that tells the thyroid to produce the thyroid hormones T4 and T3.
The thyroid hormone is actually present in two forms called T3 and T4. T4 is the macro-molecule and by the time it reaches its target tissue is hydrolyzed into T3. T3 is more than 100 times more active in metabolism than T4.
Thyroid stimulating hormone (TSH) stimulates the secretion of the hormones thyroxine (T4) and triiodothyronine (T3).