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

  • dissolved in the blood

  • as bircarbonates

  • as carbonates

  • attached to haemoglobin

Answer

B.

as bircarbonates

In our body, the blood transports the CO2 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 CO2 that dissolves in blood plasma reacts with water forming carbonic acid which dissociates into hydrogen and bicarbonate ions.
CO subscript 2 plus space straight H subscript 2 straight O space rightwards harpoon over leftwards harpoon space stack straight H subscript 2 CO subscript 3 with left parenthesis Carbonic space acid right parenthesis below
space space space straight H subscript 2 CO subscript 3 space rightwards harpoon over leftwards harpoon space straight H to the power of plus space plus space HCO subscript 3 superscript minus

(ii) About 7% of all the CO2 of transported by blood from tissues to the lungs is in dissolved state in plasma.
(iii) About 23% of CO2, collected from cells through tissue fluids, is transported by blood in the form of carbamino compound, carbamino-haemoglobin (CO2HHb).

In our body, the blood transports the CO2 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 CO2 that dissolves in blood plasma reacts with water forming carbonic acid which dissociates into hydrogen and bicarbonate ions.
CO subscript 2 plus space straight H subscript 2 straight O space rightwards harpoon over leftwards harpoon space stack straight H subscript 2 CO subscript 3 with left parenthesis Carbonic space acid right parenthesis below
space space space straight H subscript 2 CO subscript 3 space rightwards harpoon over leftwards harpoon space straight H to the power of plus space plus space HCO subscript 3 superscript minus

(ii) About 7% of all the CO2 of transported by blood from tissues to the lungs is in dissolved state in plasma.
(iii) About 23% of CO2, collected from cells through tissue fluids, is transported by blood in the form of carbamino compound, carbamino-haemoglobin (CO2HHb).