Effects of Hemorrhage and Tilting on Na,Cl,and H 2 O Absorption from the Intestine 1

Summary

Hemorrhage of 6% of estimated blood volume does not alter the ability of the gut to absorb Na or Cl against a concentration difference. Hemorrhage at the 12% level increased the ability of the gut to absorb Na against a concentration gradient. Hemorrhage at the 25% level and head upward tilting increased the ability of the gut to absorb Na against a concentration difference and also increased the volume of H₂O absorbed. Causes of the effects were not determined; but it is possible that the effects are related to cardiovascular and/or hormonal responses produced by hemorrhage and head upward tilting.