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Triiodothyronine, also known as T 3, is a thyroid hormone. It affects almost every physiological process in the body, including growth and development, metabolism, body temperature, and heart rate. [1] Production of T 3 and its prohormone thyroxine (T 4) is activated by thyroid-stimulating hormone (TSH), which is released from the anterior ...
Further information: Thyroid function tests. Triiodothyronine (T 3) and thyroxine (T 4) can be measured as free T 3 and free T 4, which are indicators of their activities in the body. [73] They can also be measured as total T 3 and total T 4, which depend on the amount that is bound to thyroxine-binding globulin (TBG). [73]
Triiodothyronine: T 3: Amino acid derivative peripheral tissue of thyroid gland: Thyroid follicular cell / Tyrosine: thyroid hormone receptor: nearly every cell in the body increased metabolism 5 Thyroxine: T 4: Amino acid derivative thyroid gland: Thyroid follicular cell / Tyrosine: thyroid hormone receptor: nearly every cell in the body
Your thyroid hormones, triiodothyronine (T3) and thyroxine (T4), are also responsible for digestion and metabolism. ... The less T3 and T4 your body produces, the less your body burns calories for ...
Effect Triiodothyronine: T3: Thyroid epithelial cell (More potent form of thyroid hormone) Stimulates body oxygen and energy consumption, thereby increasing the basal metabolic rate Stimulates RNA polymerase I and II, thereby promoting protein synthesis: Thyroxine (tetraiodothyronine) T4: Thyroid epithelial cell's (Less active form of thyroid ...
TSH (with a half-life of about an hour) stimulates the thyroid gland to secrete the hormone thyroxine (T 4), which has only a slight effect on metabolism. T 4 is converted to triiodothyronine (T 3), which is the active hormone that stimulates metabolism. About 80% of this conversion is in the liver and other organs, and 20% in the thyroid ...
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
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