Calcium: Hi parathyroid hormone (PTH) has the task of preventing low blood calcium. About 99% of the body's calcium is in the skeleton. Blood calcium is tightly regulated. If there is a threat of low blood calcium, PTH is secreted to pull calcium out of bone and put it in the blood and to reduce urinary losses of calcium and to make active vitamin D (calcitriol) to augment GI absorption of calcium.
Answered 4/7/2016
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