Haemoglobin is a type of protein. It is present in many varied organisms on our planet, and has a similar chemical structure in all of these organisms. In humans, haemoglobin is found in red blood cells. Haemoglobin’s function is the transport of oxygen around the body. Oxygen must reach all parts of our bodies because it is required in the process of cellular respiration (to produce ATP – the main molecule involved in releasing energy for all uses).

Haemoglobin is a big deal, so naturally, it has a quaternary structure (multiple protein chains linked together to form a greater functional unit which also includes inorganic molecules). Just stare in awe at this beauty:

Erythrocyte is a very easy to remember name for a red blood cell. As you can see, there are 4 protein chains: 2 alpha chains and 2 beta chains. At the centre of each chain there is a haem (or heme) group which is an inorganic group containing one…