A) dissolved in the blood
B) as bircarbonates
C) as carbonates
D) attached to haemoglobin
Correct Answer: B
Solution :
| [B] 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 CO 2 that dissolves in blood plasma reacts with water forming carbonic acid which dissociates into hydrogen and bicarbonate ions. CO2 + H2O \[\rightleftharpoons \] H2CO3 (Carbonic acid) H2CO3 \[\rightleftharpoons \] H+ + \[HCO_{3}^{-}\] (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). |
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