The primary buffer system that controls the pH of the blood is the ________ buffer system.
A)carbon dioxide, carbonate
B)carbonate, bicarbonate
C)carbonic acid, carbon dioxide
D)carbonate, carbonic acid
E)carbonic acid, bicarbonate

Question

Quizplus · Accepted Answer

The primary buffer system that controls the pH of the blood is the carbonic acid, bicarbonate buffer system. Carbonic acid (H2CO3) can dissociate to form hydrogen ions (H+) and bicarbonate ions (HCO3-). If there is an excess of hydrogen ions (resulting in lower pH), they can combine with the bicarbonate ions to form carbonic acid, thus removing excess hydrogen ions and bringing the pH back to its normal range. Similarly, if there is a deficit of hydrogen ions (resulting in higher pH), carbonic acid can dissociate to form more hydrogen ions and bicarbonate ions, thus bringing the pH back to its normal range.

The Primary Buffer System That Controls the PH of the Blood