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Figure 5


Fig. 5. Electrochemical potential for the apical anion exchange (AE) process calculated assuming intracellular Cl- concentration and apical membrane potential of 30 mmol l-1 and -100 mV, respectively, and using luminal Cl- and HCO3- concentrations from unfed gulf toadfish (Taylor and Grosell, 2006a) and different intracellular HCO3- concentrations ranging from 1.5 to 40 mmol l-1 (indicated by different symbols). Absorption of Cl- and HCO3- secretion via 1:1 anion exchange can only occur when the AE electrochemical potential is >0, which requires intracellular HCO3- concentrations of >10 mmol l-1 in the anterior intestine and close to 40 mmol l-1 in the mid intestine. See text for further details.





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