Intestinal Absorption of Phosphates

Because phosphate ions are readily absorbed by the small intestine (i.e., at efficiencies of 65-75% in adults and even higher in children), a prompt increase in serum inorganic phosphate (Pi) concentration follows within an hour after ingestion of a meal begins. (Calcium ions or Ca2+ are much more slowly absorbed.) The increased serum Pi (HPO4) concentration then depresses the serum calcium ion concentration, which in turn stimulates the parathyroid glands to synthesize and secrete PTH. PTH acts on bone and the kidneys

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