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Cells in the wall of the mammalian stomach secrete HCl at a concentration of 0.15 M. The secreted protons, which are derived from the intracellular hydration of CO2 by carbonic anhydrase, are pumped out by an (H+-K+)-ATPase antiport. A K+-Cl− cotransporter is also required to complete the overall transport process.a) Calculate the pH of the secreted HCl. How does this compare to the cytosolic pH (7.4)?
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