Which of the Following is Considered a Physiological PH Control

Question

Which of the following is considered a physiological pH control mechanism?
A) the buffers in the blood
B) the kidneys
C) the lungs
D) both B and C above

Accepted Answer

The physiological pH control mechanism involves both the kidneys and the lungs in maintaining the acid-base balance in the body. The kidneys regulate the excretion and retention of hydrogen ions and bicarbonate ions, while the lungs control the levels of carbon dioxide and the acidity of the blood. Moreover, the buffers in the blood, such as bicarbonate and proteins, also play a vital role in maintaining the pH balance by accepting or releasing H+ ions. Therefore, the correct answer is D, i.e., both B (the kidneys) and C (the lungs) are considered physiological pH control mechanisms.