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What is the parathyroid hormone?

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Quick Answer

Parathyroid hormone is a hormone that is produced by the parathyroid glands, states the American Association of Endocrine Surgeons. It raises the level of calcium in the blood.

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The parathyroid glands are four tiny glands located in the neck that control the body's calcium levels, according to the American Association of Endocrine Surgeons. When the level of calcium in the blood is too low, the parathyroid glands secrete parathyroid hormone. Parathyroid hormone raises the level of calcium in the blood in three ways: it breaks down bone, resulting in calcium release; it increases the body's ability to absorb calcium; and it increases the kidney's ability to retain calcium that would otherwise be lost in urine.

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