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The pituitary gland secretes thyrotropin (TSH; Thyroid Stimulating Hormone) that stimulates the thyroid to secrete thyroxine (T4) and, to a lesser degree, triiodothyronine (T3). The major portion of T3, however, is produced in peripheral organs, e.g. liver, adipose tissue, glia and skeletal muscle by deiodination from
Thyroid function tests (TFTs) is a collective term for blood tests used to check the function of the thyroid. [1] TFTs may be requested if a patient is thought to suffer from hyperthyroidism (overactive thyroid) or hypothyroidism (underactive thyroid), or to monitor the effectiveness of either thyroid-suppression or hormone replacement therapy.
Thyroid-stimulating hormone (also known as thyrotropin, thyrotropic hormone, or abbreviated TSH) is a pituitary hormone that stimulates the thyroid gland to produce thyroxine (T 4), and then triiodothyronine (T 3) which stimulates the metabolism of almost every tissue in the body. [1]
A deficiency of iodine leads to decreased production of T 3 and T 4, enlarges the thyroid tissue and will cause the disease known as simple goitre. [ 3 ] The major form of thyroid hormone in the blood is thyroxine (T 4 ), whose half-life of around one week [ 4 ] is longer than that of T 3 . [ 5 ]
D1, D2, and D3 regulate the levels of T4, T3, and rT3. Three primary deiodinases are responsible for thyroid hormone conversion and breakdown. Type 1 (D1) deiodinates T4 to the biologically active T3, as well as the hormonally inactive and possibly inhibitory rT3. [3] [5] Type 2 (D2) converts T4 into T3, and breaks down rT3. D3 produces rT3 ...
T4 is a prohormone; that is, T4 is a precursor to the hormone T3. Whereas T4 is a tetraiodide, T3 is a triiodide, triiodothyronine. The T4 → T3 conversion is mediated by the selenoenzyme iodothyronine deiodinase. T3-thyroxine is a unique example of an iodine compound that is essential for human health.
The T4 improved this design with tapered roller bearings on the input and output shafts and a straight roller bearing on the counter gear. The T-5 is a T4 with an added overdrive gear. [ 2 ] The T-5 carries a part number of 1352-000- xxx , where xxx is a three-digit application-specific number ranging from 001 to 260 that also can be used to ...
Propylthiouracil (PTU) is a medication used to treat hyperthyroidism. [3] This includes hyperthyroidism due to Graves' disease and toxic multinodular goiter. [3] In a thyrotoxic crisis it is generally more effective than methimazole. [3]