Haemoglobin, the protein inside red blood cells, carries ________.
Oxygen
The correct answer is Oxygen.
Haemoglobin has four globin chains, each with an iron-containing haem group that binds oxygen reversibly; one molecule carries four O2 molecules as oxyhaemoglobin from the lungs to the tissues. About 97–98% of blood oxygen is transported this way.
Haemoglobin carries only a small part of CO2 (about 20–25% as carbaminohaemoglobin; most travels as bicarbonate), and it does not transport nitrogen or ozone.
Short trick: Haem iron = oxygen carrier.
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