-folded to form villus (large surface area)
-cells lining small intestines have microvilli (large surface area)
- wall ao small intestine is thin (short diffusion distance)
-rich blood supply (maintains concentration gradient)
-cells lining small intestine have transport proteins and mitochondria
![](https://img.wattpad.com/cover/272714285-288-k56915.jpg)
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A-level Biology Notes
General FictionTopics 1-4 of A-level Biology AQA New specification