Which of the following mechanisms buffers the acidity of the blood the fastest?
A) Increased hydrogen ion elimination in the urine
B) Protein buffering system
C) The carbonic acid-bicarbonate buffer system
D) Increased respiratory rate

Question

Quizplus · Accepted Answer

The carbonic acid-bicarbonate buffer system is the fastest mechanism of buffering the acidity of the blood. This system operates through the reversible reaction between carbonic acid and bicarbonate ions, which can either release or bind hydrogen ions depending on the body's needs. This system can help to maintain pH homeostasis within seconds by rapidly adjusting the concentration of bicarbonate ions and carbon dioxide in the blood. Therefore, option (C) is the best choice.

Which of the Following Mechanisms Buffers the Acidity of the Blood