![]() ![]() ![]() At the same time, PTH signals the kidneys to release less calcium in the urine. This hormone may also activate vitamin D to improve the absorption of calcium in the intestines. If calcium levels drop too low in the blood, parathyroid hormone (PTH) will signal the bones to release calcium into the bloodstream. In order to perform these vital daily functions, the body works to keep a steady amount of calcium in the blood and tissues. About 99% of the body’s calcium is stored in bones, and the remaining 1% is found in blood, muscle, and other tissues. Calcium is a mineral most often associated with healthy bones and teeth, although it also plays an important role in blood clotting, helping muscles to contract, and regulating normal heart rhythms and nerve functions. ![]()
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