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thyroid gland (thyroid hormone (triiodothyronine (T3), thyroid hormone…
thyroid gland
thyroid hormone
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thyroid hormone synthesis requires a large amount of iodine, which must be adequately supplied in the diet
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iodine is actively transported into the epithelial cells (Na+/I- pump, or I- trap)
synthesis of thyroid hormone is partially intracellular (epithelial cells) and partially extracellular (follicular lumen) with the completed hormones stored in a colloid in the extracellular lumen until the thyroid glands are stimulated to secrete
primary action of T3 is to raise basal metabolic rates of cells by increasing the levels of intracellular catabolic enzymes and enzymes for oxidative phosphorylation
cells
c-cell
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calcitonin: a peptide hormone, composed of 32 amino acids ,which acts to reduce blood Ca2++ levels by increasing osteoblast activity
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