12. A very small decrease in the partial pressure of oxygen leads to a lot of oxygen becoming dissociated from the haemoglobin
13. Why does the graph tail off at very high concentrations? The haemoglobin is almost saturated .
14. As there are many different types of haemoglobin and respond to different conditions many oxygen dissociation curves exist but they all have the same basic shape.
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19. Dissolved carbon dioxide is acidic and this low ph is what causes the haemoglobin to change shape.
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21. This is useful as it makes sure each tissue gets the right amount of oxygen. More active tissue produces more carbon dioxide and needs more oxygen.