Hydrochloric acid secretion:
A)Is accomplished by passive diffusion.
B)Requires the dissociation of water with subsequent exchange of the hydrogen ion for potassium ion.
C)Requires anaerobic metabolism.
D)Utilize protein molecules to neutralize OH? remaining in the secretory cells.

Question

Quizplus · Accepted Answer

Hydrochloric acid secretion in the stomach involves the active transport of hydrogen ions (H+) into the gastric lumen. This process is facilitated by the enzyme H+/K+ ATPase (proton pump) which exchanges potassium ions (K+) from the gastric lumen with hydrogen ions from the parietal cells. This requires energy and is not a passive process, nor does it rely on anaerobic metabolism. The remaining hydroxide ions (OH-) in the parietal cells can combine with carbon dioxide to form bicarbonate and water, which are then transported back into the blood, rather than being neutralized by protein molecules within the cells.

Hydrochloric Acid Secretion