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The carbon dioxide is transported via blood to lungs as

1. (a) dissolved in blood plasma
2. (b) in the form of carbonic acid only
3. (c) in combination with haemoglobin only
4. (d) carbaminohaemoglobin and as carbonic acid

Correct answer: (d) carbaminohaemoglobin and as carbonic acid

Solution

Carbon dioxide is carried in blood in several forms, including as carbaminohaemoglobin and as carbonic acid/bicarbonate-related forms. The option that matches these transport forms best is the correct one.

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