Question

Which of the following is an example of buffer system in blood? 

(a) Oxygen and carbon dioxide 

(b) Oxyhaemoglobin and carboxyhaemoglobin 

(c) Bicarbonate and carbonic acid 

(d) Sodium sulphate and oxalic acid

Answer 1

Correct option: (c) Bicarbonate and carbonic acid

Human blood has its own buffer system of bicarbonate (HCO₃^-) and carbonic acid (H₂CO₃). This system maintains the blood pH in the range of 7.35 and 7.45.