In the sodium-hydrogen antiport system,
A. both Na+ and H+ are transported into the tubular cell.
B. Na+ are transported into the cell; H+ are transported out of the cell.
C. Na+ are transported out of the cell; H+ are transported into the cell.
D. Na+ are transported into the tubular lumen; H+ are transported into the cell.
E. both Na+ and H+ are transported into the tubular lumen.
Answer: B
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