Explain the buffer action of blood.

Explain the buffer action of blood.

To maintain the pH of blood buffered system work. 

e.g. (1) Carbonate buffer

(2) Phosphate buffer

(3) Protein buffer.

1) Carbonate Buffer: The buffer action is due to the creation of equilibrium by the dissociation of H₂CO₃ formed during respiration:

CO₂+H₂O → H₂CO₃

H₂CO₃ → H⁺ + HCO₃^-

2) Phosphate Buffer: Another buffer system working in the blood is Sodium di-hydrogen phosphate (NaH₂PO₄) and di-sodium hydrogen phosphate (Na₂HPO₄).

3) Protein Buffer: The protein buffer system working in the blood is formed by the combination of plasma protein and conjugated proteins like hemoglobin. Due to the combined action of the mentioned buffer systems, the pH of our blood remains unchanged in any condition.