Studies upon the mode of action of vitamin D

Abstract

The rate of absorption of Ca from isolated loops increased with increasing concentration both in normal and in vitamin D deficient rats, but the rate in the latter was considerably lower than in normal rats. The rates of absorption of Ca from the abdominal cavity and of xylose and sodium sulphate from isolated loops were identical in normal and in vitamin D deficient rats. The possibility that vitamin D affects the permeability of the absorptive epithelium of the gut is discussed.