EasyZoologyBreathing and Exchange of Gases
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Haemoglobin combines with oxygen to form:
A
Carbaminohaemoglobin
B
Oxyhaemoglobin
C
Carboxyhaemoglobin
D
Deoxyhaemoglobin
Explanation
When oxygen binds to the iron (Fe²⁺) in haemoglobin, it forms oxyhaemoglobin (HbO₂). Each haemoglobin molecule can carry 4 molecules of O₂ (one per haem group). Carbaminohaemoglobin is formed when CO₂ binds to the globin protein. Carboxyhaemoglobin is formed with carbon monoxide (CO) — it binds 250 times more strongly than O₂, causing poisoning.
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