STRUCTURE: Conjugated protein, Has globin and haem, Has 2 alpha chain and 2 beta chain, Has quaternary structure, Each polypeptide chain has haem group, Each haem group consists of porphyrin ring with iron atom, Carbon dioxide bind with amino group of haemoglobin, Oxygen bind with iron atom, CHARACTERISTICS: Has high affinity for oxygen when partial pressure of oxygen is high, Has low affinity for oxygen when partial pressure of oxygen is low, Shows cooperativity in binding/releasing oxygen between the subunits, Bind loosely and reversibly with four molecules of oxygen forming oxyhaemoglobin, Binding with oxygen influence by partial pressure of oxygen, pH, carbon dioxide concentration and temperature,

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