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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.
Bones play an important role in regulating blood calcium levels, which must be maintained within narrow limits for functions such as muscle contraction and membrane potentials to occur normally.A deficiency of blood calcium is called hypocalcemia, and an excess of blood calcium is called hypercalcemia.Bone is the major storage site for calcium in the body, and movement of calcium into and out of bone helps to determine blood calcium levels.he hormones parathyroid hormone (PTH) and calcitonin help regulate blood calcium levels. Calcitonin, secreted by the thyroid gland inhibits osteoclasts and stimulates osteoblasts, thus decreasing blood calcium levels.