Question

Buffer system of blood is-

• A. Haemoglobin
• B. Oxygen
• C. Sodium carbonate
• D. Carbonic acid

Answer 1

The correct option is D Carbonic acid

Buffer system of body consists of three individual buffers- carbonate or carbonic acid, phosphate buffer and the buffering of plasma proteins.
Blood neutralizes the metabolic acids produced by its high base concentration.
Sodium carbonate by itself is not a buffer, its just alkaline solution. A mixture of sodium carbonate and sodium bicarbonate is a buffer.

So, the correct answer is -carbonic acid.