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The carriage of oxygen
Oxygen is carried by the haemoglobin in erythrocytes. This makes the haemoglobin oxygenated
and makes it oxyhaemoglobin:
Oxygen + haemoglobin oxyhaemoglobin

Haemoglobin is a quaternary structure protein that has 4 tertiary structure polypeptide chains
and a haem (Fe2+) group at the centre of each. Each haem…

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As acid are H+ donors, and there are lots of H+ ions in the erythrocytes, the haemoglobin bonds
with them to form haemoglobinic acid. It is acting as a buffer (maintaining the pH level).

The Bohr effect:
The H+ ions from the dissociation of carbonic acid compete with oxygen molecules…

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