The passage of food through the gut of rats and its uptake of fluid

Oatley, K. and Toates, F. M. (1969). The passage of food through the gut of rats and its uptake of fluid. Psychonomic Science, 16(5) pp. 225–226.

DOI: https://doi.org/10.3758/BF03332656

Abstract

Stomachs and small intestines were examined and weighed up to 6 h after rats had been allowed to eat for 30 min without water available. A meal of commercial rat food left the stomach with a time constant of about 4 h. Each gram of food eaten attracted approximately 1 ml of additional fluid into the gut. The time course of this fluid movement and of electrolyte absorption is such that much of the drinking associated with meals in conditions of ad lib intake of food and water seems to be in anticipation of changes in the body fluids, rather than in response to them.

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