parathyroid hormone

parathyroid hormone n a hormone of the parathyroid gland that regulates the metabolism of calcium and phosphorus in the body abbr. PTH called also parathormone

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a hormone, synthesized and released by the parathyroid glands, that controls the distribution of calcium and phosphate in the body. A high level of the hormone causes transfer of calcium from the bones to the blood; a deficiency lowers blood calcium levels, causing tetany. This condition may be treated by injections of calcium gluconate. Compare calcitonin.

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a polypeptide hormone (84 amino acid residues) secreted by the parathyroid glands. It promotes release of calcium from bone to extracellular fluid by activating osteoclasts and inhibiting osteoblasts, indirectly promotes increased intestinal absorption of calcium, promotes renal tubular reabsorption of calcium and increased renal excretion of phosphates, and is a major regulator of bone metabolism. Secretion of parathyroid hormone increases when the level of calcium in the extracellular fluid is low. Its action is opposed by that of calcitonin. Called also parathormone and parathyrin.

Medical dictionary. 2011.

Look at other dictionaries:

  • Parathyroid hormone — (PTH), or parathormone, is secreted by the parathyroid glands as a polypeptide containing 84 amino acids. It acts to increase the concentration of calcium (Ca2+) in the blood, whereas calcitonin (a hormone produced by the parafollicular cells (C… …   Wikipedia

  • parathyroid hormone — parathyroid hormone. См. паратиреоидный гормон. (Источник: «Англо русский толковый словарь генетических терминов». Арефьев В.А., Лисовенко Л.А., Москва: Изд во ВНИРО, 1995 г.) …   Молекулярная биология и генетика. Толковый словарь.

  • parathyroid hormone — noun hormone synthesized and released into the blood stream by the parathyroid glands; regulates phosphorus and calcium in the body and functions in neuromuscular excitation and blood clotting • Syn: ↑parathormone • Hypernyms: ↑hormone,… …   Useful english dictionary

  • parathyroid hormone — A substance made by the parathyroid gland that helps the body store and use calcium. A higher than normal amount of parathyroid hormone causes high levels of calcium in the blood and may be a sign of disease. Also called parathormone, parathyrin …   English dictionary of cancer terms

  • parathyroid hormone — parathormone a hormone, synthesized and released by the parathyroid glands, that controls the distribution of calcium and phosphate in the body. A high level of the hormone causes transfer of calcium from the bones to the blood; a deficiency… …   The new mediacal dictionary

  • parathyroid hormone — noun Date: 1953 a hormone of the parathyroid gland that regulates the metabolism of calcium and phosphorus in the body …   New Collegiate Dictionary

  • parathyroid hormone — Biochem., Physiol. a polypeptide hormone, produced in the parathyroid glands, that helps regulate the blood levels of calcium and phosphate. Abbr.: PTH * * * …   Universalium

  • parathyroid hormone — parathy′roid hor mone n. biochem. phl pat a polypeptide hormone, produced in the parathyroid glands, that helps regulate the blood levels of calcium and phosphate Abbr.: PTH …   From formal English to slang

  • parathyroid hormone — See parathormone …   Dictionary of molecular biology

  • Parathyroid hormone receptor 1 — is a parathyroid hormone receptor It is encoded by the gene PTHR1 . It is a receptor for parathyroid hormone (PTH) and for parathyroid hormone like hormone (PTHLH).FunctionIt is the classical PTH receptor, is expressed in high levels in bone and… …   Wikipedia

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