Abstract
1. 1. We have previously described an in vivo Na transport adaptive mechanism in frogs mediated by a decrease in passive Cl permeability (conductance, G Cl) and independent of active Na transport change. 2. 2. It is produced by pre-immersion in high salinity solutions. 3. 3. Selective chloride permeability decrease, induced by preconditioning in arginine chloride solution, allows clear demonstration of the system. 4. 4. In this study, plasma from frogs preconditioned in arginine chloride was tested on isolated frog skin and met the following criteria for a humoral agent producing this mode of adaptation in Na transport : (a) decrease in G Cl (Cl flux in the short-circuited state) without change in active Na transport (short-circuit current); and (b) decrease in net Na flux when the ions were electrically coupled (open-circuit state).
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