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Carbon dioxide is transported from tissues to respiratory surface by only

1. (a) plasma and erythrocytes
2. (b) plasma
3. (c) erythrocytes
4. (d) erythrocytes and leucocytes

Correct answer: (a) plasma and erythrocytes

Solution

Carbon dioxide is not carried by only one blood component. A large fraction is transported in plasma mainly as bicarbonate, while the rest is carried by erythrocytes as dissolved CO2 or bound to hemoglobin. Leucocytes do not play a significant role in CO2 transport.

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