Answer:
Such transport mechanism is called Antiport.
Explanation:
The production of hydrochloric acid (HCl) by the parietal cells requires the activity of the enzyme, carbonic anhydrase.In the presence of carbonic anhydrase CO₂ and H₂O are converted to HCO⁻ and H⁻.
The newly generated proton (H+ )s transported into the lumen of the stomach via the e H ₊₋K +ATPase (called the proton pump)Concurrently, HCO₃ ⁻ exits from the basal surface (blood side) of the parietal cell via the HCO₃⁻ ₋ Cl antiporter.
The chloride ionneeded to form HCl, enters the parietal cell from the blood via the HCO₃⁻₋Cl⁻ antiporter and exits at the luminal side by the Cl⁻ channel. Once within the lumen of the stomach, cl⁻ combines with H⁺to form HCl.
The luminal K⁺ that is needed to maintain the activity of the proton pump(H⁺₋K⁻ATPase)enters the parietal cells from the stomach lumen by the H⁺₋K⁺ + ATPase and is then recycled back into the lumen of the stomach by the K⁺ channel.
