Which two ions can the kidney preserve or excrete to regulate the blood pH?

Question

Quizplus · Accepted Answer

The kidney can preserve and excrete hydrogen ions (H+) and bicarbonate ions (HCO3-) to regulate blood pH. If the blood pH drops, the kidney can excrete more hydrogen ions and retain more bicarbonate ions to raise the pH. If the blood pH rises, the kidney can excrete more bicarbonate ions and retain more hydrogen ions to lower the pH. Carbon and oxygen are not ions and do not play a direct role in regulating blood pH.

Which Two Ions Can the Kidney Preserve or Excrete to Regulate