Functions of vitamin D related to calcium and phosphate metabolism are as following
It promotes intestinal absorption of calcium and phosphate
Vitamin D directly suppresses parathyroid hormone release
Vitamin D has a permissive role for parathormone to cause bone resorption
Vitamin D promotes Calcium reabsorption from distal Renal tubule in Kidneys
It may be noted that the reabsorption of calcium through proximal renal tubule is passive
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