A Decline in PH Causes the Kidneys to Increase Reabsorption

Question

A decline in pH causes the kidneys to increase reabsorption of which substance?  
A) Bicarbonate
B) Hydrogen ions
C) Carbon dioxide
D) Carbonic acid
E) Phosphates

Accepted Answer

A decline in pH indicates an increase in hydrogen ions in the blood. As a result, the kidneys will increase the reabsorption of bicarbonate, which helps to neutralize the excess hydrogen ions by forming carbonic acid.