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. 1998 Apr-Jun;2(2):163–167.

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© 1998 by the Society of Laparoendoscopic Surgeons

This is an Open Access article distributed under the terms of the Creative Commons Attribution Non-Commercial No Derivatives License (http://creativecommons.org/licenses/by-nc-nd/3.0/), which permits for noncommercial use, distribution, and reproduction in any medium, provided the original work is properly cited and is not altered in any way.

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Figure 2. — Diagram illustrating the steps of hydrochloric acid secretion by the parietal cells of the stomach. Carbon dioxide is hydrated to carbonic acid, which dissociates into H+ + HCO₃-. The proton pump actively extrudes H+ in exchange for K+, while the HCO₃- is secreted in exchange for HC₁-.