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structure
globular protein with 4 polypeptide chains, 2alpha globin and 2 beta globin…each chain consists of a haem group with Fe2+ that binds to oxygen reversibly
oxyhaemoglobin formula
Hb+4O2—>HbO8
haemoglobin saturation
dependent on the partial pressure of oxygen in surroundings
association
occurs when partial pressure of oxygen is high
dissociation
occurs when partial pressure of oxygen is low
importance of haemoglobin
quick and efficient loading of oxygen in lungs…efficient unloading in respiring tissues
haemoglobin dissociation curve
shows oxygen saturation levels relative to the partial pressure of oxygen
partial pressure of oxygen in the atmosphere at sea level
20kPa
partial pressure in the lungs at sea level
13kPa
partial pressure at high altitude in atmosphere
10kPa
partial pressure in lungs at high altitude
5.3kPa