The formation of HCl in the stomach involves the
A. active transport of H+ from parietal cells into the lumen of the stomach.
B. exchange of Na+ for H+ in the transport process.
C. exchange of Na+ and bicarbonate ions.
D. active transport of Cl? from parietal cells into the lumen of the stomach.
E. the combination of CO2 and water.
Answer: A
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