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The thyroid system of the thyroid hormones T 3 and T 4 [1] Thyroid hormones are any hormones produced and released by the thyroid gland, namely triiodothyronine (T 3) and thyroxine (T 4). They are tyrosine-based hormones that are primarily responsible for regulation of metabolism. T 3 and T 4 are partially composed of iodine, derived from food. [2]
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GPnotebook: Thyroid hormone function Retrieved on Nov 25, 2009. Cite: " Both T3 and T4: *increase cell metabolism *facilitate normal growth *facilitate normal mental development *increase the local effects of catecholamines; Date: 25 November 2009: Source: All used images are in public domain. Author: Mikael Häggström: Other versions
3,5-T 2 is an active thyroid hormone. It stimulates the TR-beta receptor for thyroid hormones and thus increases energy expenditure. [1] [2] It has agonistic (thyromimetic) effects at myocardial tissue and pituitary, which results in 3,5-T 2 suppressing TSH release.
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 from T4, and breaks down T3.
The thyroid is found in the neck, and is responsible for producing hormones that in turn play a role in metabolism, growth and development in children, temperature regulation and in the ...
3,3'-Diiodothyronine, also known as 3,3'-T 2, is a metabolite of thyroid hormone. It is formed from the breakdown of triiodothyronine . Levels can be affected in certain disease states.
DIT is a modulator of the enzyme thyroid peroxidase (which is involved in the production of thyroid hormones). [1] Triiodothyronine is formed, when diiodotyrosine is combined with monoiodotyrosine (in the colloid of the thyroid follicle). Two molecules of DIT combine to make the thyroid hormone thyroxine ('T4' and 'T3').
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