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Diffusion Rate Explain Structure Capillaries Related Function.  Marks

Front Explain how the structure of capillaries is related to their function. 
( 2 marks)
Back walls / endothelium one cell thick / made of flattened cells; short diffusion pathway

narrow lumen; reduces rate of flow / more time for diffusion;

gaps / pores between cells (accept fenestrations between cells); increased rate of diffusion / fluid movement out of vessel;

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