2.59 explain how adaptations of red blood cells, including shape, structure and the presence of haemoglobin, make them suitable for the transport of oxygen

  • Red blood cells carry oxygen around the body
  • Haemoglobin iron that bonds with oxygen
  • No nucleus – this makes room for the haemoglobin (this is called an enucleated cell)
  • No mitochondria as they respire anaerobically – cells don’t use the oxygen they transport.
  • Biconcave properties – (flat with a depression in the centre). This round shape allows them to pass through narrow capillaries, dip increases surface area and distance for difussion

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