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The major target end organs for parathyroid hormone (PTH) action are the kidneys, skeletal system, and intestine. The primary response to parathyroid hormone (PTH) by the kidney is to increase renal calcium resorption and phosphate excretion.
They think that the low vitamin D levels cause too little calcium to be absorbed in the intestines. They think that this low amount of calcium is sensed by normal parathyroid glands which causes the normal parathyroid glands to appropriately increase their production... causing a high PTH level.