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CARBON DIOXIDE TRANSPORT
carbon dioxide is
carbon dioxide 90% of the carbon another 7% remain
diffuse into dioxide will diffuse dissolved in the
product of cellular
capillaries into RBC blood plasma
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
9. Carbon dioxide then diffuse out of capillaries into
the alveolar space to be exhaled out of the lungs.