The diagram illustrates the route by which carbon dioxide is transported in red blood cells.
- A1: carbaminohaemoglobin; 2: haemoglobinic acid; 3: hydrogen ions; 4: hydrogencarbonate ions
- B1: carbonic anhydrase; 2: carbonic acid; 3: hydrogen ions; 4: hydrogencarbonate ions
- C1: carboxyhaemoglobin; 2: carbonic anhydrase; 3: carbonic acid; 4: carbon dioxide
- D1: haemoglobinic acid; 2: carbonic acid; 3: hydrogencarbonate ions; 4: hydrogen ions