In the Sodium-Hydrogen Antiport System

Multiple Choice

In the sodium-hydrogen antiport system,

A) both Na⁺ and H⁺ are transported into the tubular lumen.
B) both Na⁺ and H⁺ are transported into the tubular cell.
C) Na⁺ are transported into the cell; H⁺ are transported out of the cell.
D) Na⁺ are transported into the tubular lumen; H⁺ are transported into the cell.
E) Na⁺ are transported out of the cell; H⁺ are transported into the cell.