Which is TRUE regarding the secretion of HCl in the stomach?
A. The pH of the blood leaving the area of the parietal cells is lower than the normal ECF value of 7.4.
B. H+ is actively cotransported into the lumen by secondary active transporters coupled to K+.
C. Cl- and HCO3- are exchanged across the luminal membrane of epithelial cells via a passive transport protein.
D. H+ is actively transported into the gastric lumen by ATPase pumps in the mucosal membrane.
E. H+ diffuses passively from mucosal epithelial cells into the lumen of the stomach, following Cl-.
Answer: D
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