4 glands behind and on the thyroid that regulate calcium and are unrelated to the thyroid. The physiology of calcium and phosphate metabolism, the function of vitamin D, formation of bone & teeth are tied together with parathormone (PTH) and calcitonin. Vitamin D compound dihydroxycholecalciferol is stimulated by the parathyroid and controls intestinal tract absorption of calcium. If there is too much PTH due to a benign tumor, the personality may change and bones will decalcify.
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