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→Adaptations of Villi
[[Villi]] are small folds in the wall of the [[Small Intestine|small intestine]] that increase its [[Surface Area|surface area]].
: Singular [[Noun]]: '''Villus''': Plural [[Noun]]: '''Villi'''
===Adaptations of Villi===
: [[Villi]] have a wall only one cell thick so the [[nutrient]]s only have a short distance to [[Diffusion|diffuse]] into the [[blood]].: [[Villi]] have [[Capillary|capillaries]] inside them for a good blood supply to allow for quick [[diffusion]] into the [[blood]].
: [[Villi]] have a large [[Surface Area|surface area]] to allow quicker [[diffusion]].
: The [[Cell (Biology)|cells]] in the walls of the [[villi]] have [[microvilli]] to provide an even bigger [[Surface Area|surface area]] for quicker [[diffusion]].
===About Villi===
|[[File:VillusDiagram.png|center|400px]]
|}
==Key Stage 4==
===Meaning===
[[File:VilliPicture.png|right|300px|thumb|A computer generated image of many villi.]]
[[Villi]] are small folds in the wall of the [[Small Intestine|small intestine]] that increase its [[Surface Area|surface area]].
===Adaptations of Villi===
: [[Villi]] have a wall only one cell thick so the [[nutrient]]s only have a short distance to [[Diffusion|diffuse]] into the [[blood]].
: [[Villi]] have [[Capillary|capillaries]] in order to constantly supply enough fresh [[blood]] with few [[nutrients]] keeping a high [[Concentration Gradient|concentration gradient]] between the food and the [[blood]].
: [[Villi]] have a large [[Surface Area|surface area]] to allow quicker [[diffusion]].
: The [[Cell (Biology)|cells]] in the walls of the [[villi]] have [[microvilli]] to provide an even bigger [[Surface Area|surface area]] for quicker [[diffusion]].
===About Villi===
: [[Villi]] cover inside of the [[Small Intestine|small intestine]].
: [[Villi]] increase the [[Surface Area|surface area]] of the [[Small Intestine|small intestine]].
{| class="wikitable"
|-
|[[File:VillusDiagram.png|center|400px]]
|}
===References===
====AQA====
:[https://www.amazon.co.uk/gp/product/1782945598/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=1782945598&linkCode=as2&tag=nrjc-21&linkId=ad276ad49df77ab4b40ab4fd0fe10403 ''Villi, page 21, GCSE Combined Science; The Revision Guide, CGP, 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 ''Villi, page 24, GCSE Biology; The Revision Guide, CGP, AQA '']
:[https://www.amazon.co.uk/gp/product/1471851354/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=1471851354&linkCode=as2&tag=nrjc-21&linkId=9012a0d354024419214fb3ad5ac44ba0 ''Villi, page 45, GCSE Combined Science Trilogy 1, Hodder, 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 ''Villi, page 59, 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 ''Villi, page 65, GCSE Biology, CGP, AQA '']
:[https://www.amazon.co.uk/gp/product/0198359373/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=0198359373&linkCode=as2&tag=nrjc-21&linkId=952a73bbb09d222ecc4b50d200679849 ''Villi, pages 15, 23, 39, GCSE Biology; Third Edition, Oxford University Press, AQA '']
====OCR====
:[https://www.amazon.co.uk/gp/product/1782945660/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=1782945660&linkCode=as2&tag=nrjc-21&linkId=83aa4500ad7759e7f401a1c5ba5df758 ''Villi, page 34, Gateway GCSE Biology; The Revision Guide, CGP, OCR '']
:[https://www.amazon.co.uk/gp/product/0198359810/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=0198359810&linkCode=as2&tag=nrjc-21&linkId=d768d99f1a06f7c12fab40e5aef85a55 ''Villi, pages 63, 73, Gateway GCSE Biology, Oxford, OCR '']