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Question

Buffer system of blood is :

A
Haemoglobin
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B
Oxygen
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C
Sodium carbonate
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D
Carbonic acid
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Solution

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.

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