An increased secretion of H ions in the kidney has the greatest direct effect on the tubular secretion of which of these ions
A)calcium
B)chloride
C)phosphate
D)potassium

Question

Quizplus · Accepted Answer

An increased secretion of H ions in the kidney is associated with an increase in the secretion of potassium ions. This is because, in the proximal tubule, H ions are exchanged for Na ions through the Na/H exchanger. This exchange creates a favorable electrochemical gradient for the secretion of K ions through the K channels in the same segment of the tubule. Therefore, the increased secretion of H ions in the kidney will have the greatest direct effect on the tubular secretion of potassium ions.

An Increased Secretion of H Ions in the Kidney Has