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Question

Most carbon dioxide in blood is in the form of

A
carbon dioxide
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B
carbonic acid
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C
carbon monoxide
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D
hydrogencarbonate
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Solution

The correct option is D hydrogencarbonate
Carbon dioxide is transported in the blood from the tissue to the lungs in three ways: (i) dissolved in solution; (ii) buffered with bicarbonate and (iii) bound to proteins, particularly haemoglobin. Majority of the carbon dioxide in the blood is carried by means of a bicarbonate buffer system. So, the correct option is 'hydrogen carbonate'.

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