Which main reaction takes place in the blood capillaries at the gas-exchange surface of a human lung?
- ACarbonic acid dissociates into carbon dioxide and hydrogen ions.
- BCarbonic anhydrase converts carbon dioxide into hydrogencarbonate ions.
- CCarbon dioxide combines with haemoglobin to form carbaminohaemoglobin.
- DCarbon dioxide is produced from hydrogencarbonate ions by carbonic anhydrase.