Which of the following is a characteristic of the gastric proton pump?

Question

Quizplus · Accepted Answer

The gastric proton pump is a H⁺,K⁺-ATPase, which means it pumps hydrogen ions (H⁺) out of the parietal cell into the stomach lumen in exchange for potassium ions (K⁺) from the extracellular fluid. This is a key mechanism for creating the low pH environment in the stomach necessary for digestion. Option B is incorrect because the gastric proton pump does not require high levels of dietary K⁺, but rather utilizes K⁺ ions already present in the body. Option C is incorrect because the pH gradient across the mucosal cell membrane is closer to 1-2 rather than 4.6. Option D is incorrect because the gastric proton pump produces a net influx of HCl into the stomach, not efflux.

Which of the Following Is a Characteristic of the Gastric