Abstract
AbstractAlligators in fresh water regulate their plasma and cloacal fluid electrolytes at concentrations similar to those of other crocodilians. They have an exchangeable Na pool of 60.8 μmol/gm and a unidirectional Na efflux of 3.9 μmol/100 gm·hr. Of this 11% is excreted from the cloaca, 43% presumably diffuses across the body integument, and the remaining 46% is lost from the head region. The integumental Na efflux is estimated to be 0.01 μmol/cm2·hr. In fresh water the net flux is 0.5 μmol/100 gm·hr, which suggests that nondietary Na uptake can compensate for 86% of unidirectional Na loss.
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