What is correct about the transport of carbon dioxide by blood?
1 The enzyme carbonic anhydrase catalyses the formation of carbonic acid in red blood cells.
2 Carbon dioxide diffuses from active cells to red blood cells and reacts with water.
3 Carbonic acid dissociates forming hydrogen ions that combine with haemoglobin to form carbaminohaemoglobin.
1 )
1, 2 and 3
1 and 2 only
3 )
2 and 3 only
4 )
3 only
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