The diagram shows a red blood cell from a person who has sickle cell anaemia.
This condition results in red blood cells that are sickle shaped.
People with sickle cell anaemia can feel tired.
Which statement about sickle cells explains why?
1 )
They contain a nucleus.
They have a smaller surface area.
3 )
They have more haemoglobin.
4 )
They leave capillaries and enter tissues.
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