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13 December 2022
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Created page with "== Red blood cells == thumb|Structure of red blood cells RBCs are small cells in the blood. They’re red, which is why the blood is red as well. RBCs are 7 – 8 µm in diameter, and they have a ''biconcave disc'' shape, which is difficult to explain but easier to show. The shape is important because it allows the cells to be flexible. The RBCs must squeeze through very small vessels called capillaries, which may be around 5 – 10 µm in dia..."
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