what regulates calcium levels
Parathyroid Glands: Essentials. 1  Parathyroid hormone regulates the bodyâs calcium levels. 2  There are four parathyroid glands, and they are each about the size of a grain of rice.3  Though theyâre located near each other, the parathyroid glands are not related to the thyroid gland. PTH regulates how much calcium is absorbed from your diet, how much calcium is excreted by your kidneys, and how much calcium is stored in your bones. 2  We store many pounds of calcium in our bones, and it is readily available to the rest of the body at the request of the parathyroid glands.