[In-situ intestinal loop study of the carbohydrate and phosphate modulation of calcium absorption].

Absorption of 45Ca from a 10 or 20 mM CaCl2 solution given into rat by injection in jejunal or ileal loops in situ is lowered by sodium phosphate and enhanced by L-xylose. Curves relative to the magnitude of absorption depending of doses of phosphate (5 to 50 mM) or carbohydrate (10 to 150 mM) are similar to those which account for the effect of activators or inhibitors upon the activity of enzymes.