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The parathyroid hormone regulates the blood levels of calcium. The hormone helps keep the calcium levels constant as it acts on kidneys, intestines and bones. Continue Reading. Maintaining a level blood calcium concentration is crucial to the function of nerves and muscle contractions. The parathyroid hormone, or PTH, is excreted from the parathyroid glands when blood calcium levels drop. The bones, intestines and kidneys are targeted during the release of PTH. The function of PTH varies, but in general, the hormone helps to stimulate reabsorption of the calcium and acts as a trigger to increase calcium absorption in the intestines. When the blood calcium levels rise, the PTH release is inhibited.
Parathyroid hormone is secreted by the parathyroid glands and is the most important regulator of calcium levels in the blood and within the bones.Alternative names for parathyroid hormone PTH; parathormone; parathyrin.arathyroid hormone regulates calcium levels in the blood, largely by increasing the levels when they are too low. It does this through its actions on the kidneys, bones and intestine: Bones-Parathyroid hormone stimulates the release of calcium from large calcium stores in the bones into the bloodstream.