<prompt> Answer this question truthfullyWhat is the mechanism by which H ions are secreted on the luminal membrane of the α-intercalated cells in the collecting duct of the kidney?  <response>: <reason> H ions are secreted by the H-ATPase pump on the luminal membrane of the α-intercalated cells in the collecting duct of the kidney. This pump uses energy from ATP hydrolysis to transport H ions from the cytoplasm of the cell into the lumen of the collecting duct, helping to regulate the pH balance of the body. 