In the proximal tubule, hydrogen ions are transported into the filtrate by
A) Na+/H+countertransporters only.
B) H+ primary active transporters only.
C) H+/Cl- cotransporters only.
D) both Na+/H+ countertransporters and H+ primary active transporters.
E) both Na+/H+ countertransporters and H+/Cl- cotransporters.
Answer: D) both Na+/H+ countertransporters and H+ primary active transporters.
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