THE DEPENDENCE OF NORMAL PLASMA PH ON SODIUM CONCENTRATION IN AMPHIBIANS, REPTILES AND MAN

Normal plasma pH at a given temperature is typically higher in freshwa ter turtles than in other reptiles, but lower than in amphibians, Norm al pH in the different species at a given temperature shows a negative correlation with sodium concentration. Human plasma fits this pattern . What may be more nearly constant from species to species than plasma pH is the pH at particular sites on cell surfaces, and therefore the ionization of proteins located there.