- 5% dissolved directly into plasma
- 10% combines with haemoglobin to form carbaminohaemoglobin
- 85% are transported as hydrogencarbonate ions
Where do the hydrogencarbonate ions come from?:
1. Carbon dioxide reacts with water to form carbonic acid (H2CO3), the reaction is catalysed by carbonic anhydrase.
2. The carbonic acid dissociates to form hydorgencarbonate ions (HCO3−) and hydrogen ions (H+)
To stop becoming too acidic, haemoglobin takes in the H+ ions to form haemoglobonic acid.
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