3.2.1 The buffer systems Listen

The pH in the blood must be closely controlled and kept stable, and for this to work we have different buffer systems. A buffer is a substance that can bind both acid (H+) and bases (OH) so that the pH does not change much even if the amount of acid or base increases. The buffer resists pH changes. The three buffer systems we use are:

  • the bicarbonate buffer system (HCO3)
  • the phosphate buffer system (HPO4)
  • the protein buffer system