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Carbon dioxide transport

  1. 1. CARBON DIOXIDE TRANSPORT carbon dioxide is carbon dioxide 90% of the carbon another 7% remain produced as diffuse into dioxide will diffuse dissolved in the product of cellular capillaries into RBC blood plasma respiration Ways of transportation of carbon dioxide 1. As bicarbonate ion HCO3- (70%) 2. Dissolve in the blood plasma and forming H2CO3 (7%) 3. Combine with hemoglobin to form carbaminohemoglobin (23%) 1. CO2 diffuse into RBC. 2. Carbonic anhydrase (enzyme) will catalyse the conversion of CO2 and water into H2CO3. **note that this reaction can be reversed 3. H2CO3 then split into H+ and HCO3- 4. Hemoglobin will combine with H+ to avoid increase of acidity of blood 5. HCO3- will diffuse into blood plasma and carried away to the lungs 6. At the lungs, HCO3- will recombine with H+ which is released back by hemoglobin 7. HCO3- and H+ form H2CO3 (carbonic acid) 8. Carbonic acid then converted back into water and carbon dioxide 9. Carbon dioxide then diffuse out of capillaries into the alveolar space to be exhaled out of the lungs.