ANSWERS: 2
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Biconcave disk shape - large surface area No nucleus - lots of space for haemoglobin
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In my opinion the most important structural characteristic of the red cell is it's deformability. This is the ability of the red cell to change it's shape in order to squeeze through small blood vessels. As the red cell ages it loses it's deformability and is no longer able to function correctly so it is removed and recycled by the spleen. This is approx after 21 days in circulation
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