Haemoglobin
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4 Terms
how many molecules of oxygen can haemoglobin carry?
4
what depends on the partial pressure of oxygen (pO2)? (in terms of haemoglobin)
the amount that associates
What happen when the partial pressure is high? (in terms of haemoglobin)?
It readily associates
therefore blood leading to the alveoli is 98% saturated with oxygen
this relationship is shown in the oxyhaemoglobin dissociation curve
what is the oxyhaemoglobin dissociation curve?
a curve which shows how haemoglobin saturation varies as partial pressure of oxygen changes.
E.g. during exercise pO2 in the muscles drops to 5 and the saturation of haemoglobin drops to 25%. 75% of oxygen is released to the muscle cells in order to supply the increased demand of oxygen required for respiration.
Note 
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