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:**The [[Cell (Biology)|cells]] in the walls of the [[villi]] have [[microvilli]] to provide an even bigger [[Surface Area|surface area]] for quicker [[diffusion]].
:***The [[microvilli]] have extra [[mitochondria]] to provide energy for [[Active Transport|active transport]].
===References===
====AQA====
:[https://www.amazon.co.uk/gp/product/1782945563/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=1782945563&linkCode=as2&tag=nrjc-21&linkId=9a1d023a374038e6072f33c4f3cf808b ''Exchange surfaces, pages 23-25, GCSE Biology; The Revision Guide, CGP, AQA '']
:[https://www.amazon.co.uk/gp/product/1782946381/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=1782946381&linkCode=as2&tag=nrjc-21&linkId=5ec5fc3f6429e30c1d9ab9bca2bccf93 ''Exchange surfaces, pages 54-56, GCSE Combined Science Trilogy; Biology, CGP, AQA '']
:[https://www.amazon.co.uk/gp/product/1782945954/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=1782945954&linkCode=as2&tag=nrjc-21&linkId=100574c08fbbb64318256eb79ed61a76 ''Exchange surfaces, pages 60-62, GCSE Biology, CGP, AQA '']