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  4. The majority of carbon dioxide produced by our body cells is transported to the lungs

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Q. The majority of carbon dioxide produced by our body cells is transported to the lungs

Bihar CECEBihar CECE 2013

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) $ .