4. Adaptations
of haemoglobin to transport oxygen
Answer
Each
haemoglobin molecule consists of 4 polypeptide chains.Each polypeptide in
haemoglobin has a haem group.In the middle of the haem group is ferrum ion that
could bind with oxygen molecules.So each haemoglobin molecule can bind with
four oxygen molecules.In the lung,haemoglobin will only bind oxygen
molecules,this is because haemoglobin has a high affinity for oxygen in the
lungs.In tissues,haemoglobin will release oxygen.This is because haemoglobin
has low affinity for oxygen in tissue.
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