Blood PH is Kept near a Value of 7

Question

Blood pH is kept near a value of 7.3-7.5 because of ____.  
A) salts
B) buffers
C) acids
D) bases
E) water

Accepted Answer

Buffers are chemicals that help to maintain a stable pH by absorbing excess H+ or OH- ions. In the case of blood, the bicarbonate buffer system helps to regulate the pH and prevent acidosis or alkalosis. Salts, acids, and bases can all affect pH, but they do not play as significant a role as buffers in maintaining the pH of blood. Water is involved in many physiological processes, but it does not directly contribute to the maintenance of blood pH.