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b2 (chemistry of food - required practical, animal organisation, non…

- - - - very long - human length is around 5m
        
        provides a very large surface area for the absorption of molecules
      - the interior of the small intestines is covered in millions of villi
        
        massively increases the surface area for the absorption of molecules
        
        they have a good blood supply so the bloodstream rapidly removes the products of digestion
        
        they have a thin membrane meaning a short diffusion path
      - all these features mean that there is a rapid rate of diffusion, any molecules that cannot be absorbed by diffusion are carried away active transport