3.2.4 Haemoglobin

In this lesson we looked at the function of haemoglobin, how its’ structure relates to its function and the oxygen dissociation curve for different types of haemoglobin.

To recap:

  • haemoglobin is a quaternary structure protein that contains 4 iron based haem groups
  • oxygen molecules bind to these haem groups in a process known as loading.
  • Oxygen is loaded where there is a high partial pressure of oxygen (in the lungs).
  • It is unloaded at the respiring tissues due to the high concentration of carbon dioxide which causes haemoglobin to loose its’ affinity for oxygen.

Here is a video explaining the structure and function of haemoglobin:

You will need to be able to explain something called the Bohr effect which relates to the way the oxygen dissociation curve for haemoglobin changes its’ position according to the pH and temperature of the blood.

bohr effect








To learn more about this follow this link to the excellent revision pages at S-cool.



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