Final answer:
To compensate for hyperventilation, the kidneys increase the reabsorption of bicarbonate and increase the secretion of hydrogen ions.
Step-by-step explanation:
In order to compensate for hyperventilation, the kidneys increase the reabsorption of bicarbonate and increase the secretion of hydrogen ions. These processes help maintain the proper balance of bicarbonate and carbonic acid in the blood, counteracting the alkalosis caused by hyperventilation.