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Transport of carbon dioxide

Transport of carbon dioxide

Carbon dioxide is carried through the following ways

1.1 Inform of carbohydrate

As bicarbonate, about 70% of CO2 is carried by RBCs in the blood with H2O and form carbonic acid (H2CO3), which soon dissociated to form bicarbonate ions (HCO3-) and H+ ions. This reaction is catalyzed by carbonic anhydrase. Thus the CO2 trapped as bicarbonate and transported to alveoli is released as CO2.

Figure: Transport of carbon dioxide in Inform of carbohydrate

1.2 Inform of Carbaminohaemoglobin

As carbaminohaemoglobin, about 20 – 25% of O2. When pCO2 is high, and pO2is low as in the tissue, more binding of carbon dioxide occurs s when the pCO2 is low, and pO2 is high in the alveoli, dissociation of CO2 from carbamino-haemoglobin takes place, i.e., carbon dioxide which is bound haemoglobin from the tissue is delivered at the alveoli.

1.3 In the dissolved state

As dissolves gas, about 7% of CO2 in the blood is carried in a dissolved state through the plasma.

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