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An important aspect, or component, of calcium metabolism is plasma calcium homeostasis, which describes the mechanisms whereby the concentration of calcium ions in the blood plasma is kept within very narrow limits. Derangements of this mechanism lead to hypercalcemia or hypocalcemia, both of which can have important consequences for health.
The parathyroid glands secrete PTH, a substance that helps maintain the correct balance of calcium and phosphorus in the body. PTH regulates the level of calcium in the blood, release of calcium from bone, absorption of calcium in the intestine, and excretion of calcium in the urine.When the level of calcium in the blood falls too low, the parathyroid glands secrete just enough PTH to restore the blood calcium level.TH regulates the level of calcium in the blood, release of calcium from bone, absorption of calcium in the intestine, and excretion of calcium in the urine. When the level of calcium in the blood falls too low, the parathyroid glands secrete just enough PTH to restore the blood calcium level.