In the basolateral membrane of proximal tubular cells, bicarbonate is moved out of the cells by
A) K+/HCO3- countertransporters only.
B) HCO3-/Cl- countertransporters only.
C) Na+/HCO3- cotransporters only.
D) both K+/HCO3- and HCO3-/Cl- countertransporters.
E) both HCO3-/Cl- countertransporters and Na+/HCO3- cotransporters.
Ans: E) both HCO3-/Cl- countertransporters and Na+/HCO3- cotransporters.
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