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The way I learned it during the year was that PTH binds to receptors on the surfaces of kidney and bone cells, not those of the small intestine. When it binds to kidney cells, some of them release the hormone 1,25 dihydroxyvitamin D. It is this hormone that diffuses into intestinal cells to increase calcium reabsorption.
TPR's Biology book states that one of the targets of PTH is the small intestine. Which is correct for the MCAT?
TPR's Biology book states that one of the targets of PTH is the small intestine. Which is correct for the MCAT?