title: The kinetics of intestinal calcium absorption in the rat: an analytical and model building study.
abstract: The experimental data obtained from in vivo single pass perfusion of duodenal, jejunal, and ileal intestinal segments of 33- and 50-day-old rats have been used to test a series of models for calcium absorption. Each model was checked for the statistical validity and goodness-of-fit with the experimental data. The model adopted for the duodenum and jejunum had two major components, one saturable and the other nonsaturable, and a minor secretory component. This model was not applicable to ileal calcium absorption. Here the secretory component appeared to be much more important, and the absorption parameters varied in such a manner as to suggest that this intestinal segment was capable of short term autoregulation of dietary calcium absorption.
mesh_terms: D000818:Animals; D002118:Calcium / Q000378:metabolism*; D004386:Duodenum / Q000378:metabolism; D007082:Ileum / Q000378:metabolism; D007408:Intestinal Absorption; D007583:Jejunum / Q000378:metabolism; D008297:Male; D008433:Mathematics; D008954:Models, Biological; D010477:Perfusion; D051381:Rats; D011919:Rats, Inbred Strains
chemical_list: D002118:Calcium