Abstract
Summary
Calcium absorption studied in vivo was not increased by excessive Vit. D, nor decreased (actually increased) by concomitant cortisone or corticosterone administration. Active calcium transport studied in vitro was confined to the proximal small intestine, which was increased by excessive Vit. D and decreased by concomitant cortisone or corticosterone. Therefore, with the drugs, dosages, and time relationships used in this study, the in vitro intestinal sac technic is not considered a valid index of net calcium absorption in the intact animal.
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