A) dissolved in the blood
B) as bicarbonates
C) as carbonates
D) attached to haemoglobin
Correct Answer: D
Solution :
In our body, the blood transports the \[C{{O}_{2}}\] in three ways (i) Majority of carbon dioxide produced (70%) in our cells is transported in the form of bicarbonates. In this way first, the \[C{{O}_{2}}\] that dissolves in blood plasma reacts with water forming carbonic acid, which dissociates into hydrogen and bicarbonate ions. \[C{{O}_{2}}+{{H}_{2}}O\xrightarrow{{}}\underset{Carbonic\text{ }acid}{\mathop{{{H}_{2}}C{{O}_{3}}}}\,\] \[{{H}_{2}}C{{O}_{3}}\xrightarrow{{}}{{H}^{+}}+HC{{O}_{3}}\] (ii) About 7% of all the \[C{{O}_{2}}\] of transported by blood from tissues to the lungs is in dissolved state in plasma. (iii) About 23% of \[C{{O}_{2}}\], collected from cells through tissue fluids, is transported by blood in the form of carbamino compound, carbamino -haemoglobin \[(C{{O}_{2}}HHb)\].
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