Abstract
In a medium containing physiological amounts of ionized calcium (1.25 mM) inverted sacs of rat small intestine are able to actively transport Ca46 from mucosa to serosa against a concentration gradient. Parathyroidectomy 3 or more hours before isolation of the intestinal sac results in a decreased ability of such sacs to develop and maintain a concentration difference between the serosal and mucosal fluids.

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