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Introduction
· Oxygen is transported in red blood cells
· Inside the red blood cells, oxygen binds to the
haemoglobin…read more

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Haemoglobin
· These are a group of chemically similar
molecules that are found in red blood cells.
These are biconcave discs (increase surface
area for oxygen absorption) and they have no
nucleus (more space).
· Human haemoglobin is a protein and consists
of 4 polypeptide chains ­ it shows quaternary
levels of protein structure.…read more

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Affinity
· Haemoglobin has high affinity for oxygen. This
affinity changes depending on factors such as
concentration of oxygen or carbon dioxide
and temperature. Haemoglobin with oxygen
attached to it is called oxyhaemoglobin.…read more

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High affinity
· Haemoglobin has high affinity for oxygen
when the concentration of oxygen is high e.g.
The lungs. Here, oxygen associates (attaches)
to the haemoglobin.…read more

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Low affinity
· Oxyhaeomoglobin releases the oxygen when
the concentration of oxygen is low (e.g. The
tissue capillaries). Now the oxygen dissociates
from the haemoglobin. So, at low partial
pressures of oxygen, haemoglobin has a lower
affinity for oxygen.…read more

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