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Although much CO₂ is carried in blood, yet blood does not become acidic, because

1. (a) it is absorbed by the leucocytes
2. (b) blood buffers play an important role in CO₂ transport.
3. (c) it combines with water to form H₂CO₃ which is neutralized by NaCO₃
4. (d) it is continuously diffused through tissues and is not allowed to accumulate

Correct answer: (b) blood buffers play an important role in CO₂ transport.

Solution

CO₂ in blood can form carbonic acid, which would lower pH, but hemoglobin and plasma buffers limit this change. These buffers allow CO₂ to be transported without making blood markedly acidic.

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