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Dietary sodium ion effects of trans epithelial transport of sodium chloride by hen gallus domesticus lower intestine colon and coprodaeum perfused luminally in vivo



Dietary sodium ion effects of trans epithelial transport of sodium chloride by hen gallus domesticus lower intestine colon and coprodaeum perfused luminally in vivo



Pfluegers Archiv European Journal of Physiology 379(3): 229-236



The colon and coprodeum of anesthetized laying hens was perfused luminally with solutions of varying compositions, to elucidate the influence of 3 levels of dietary NaCl and of luminal NaCl concentrations on coprodeal and colonic transport of NaCl. Net Na+ and Cl- absorption rates were increased in response to low dietary Na+ levels and higher luminal NaCl concentrations. Net Na+ absorption was always against the prevailing electrochemical gradient, saturably dependent on luminal Na+ concentrations in low Na+ diet birds, and linearly dependent on luminal concentrations in medium and high Na+ diet birds. Net Cl- absorption was usually down its electrochemical gradient. The Cl- flux rates were strongly linearly dependent on Na+ flux rates, and statistically this relationship could account for all significant variation of Cl- fluxes associated with dietary and perfusate treatments. Transmural electrical potential differences were invariably serosa positive, and partly correlated with Na+ fluxes.

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