Difference between revisions of "Villi"
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[[Villi]] are small folds in the wall of the [[Small Intestine|small intestine]] that increase its [[Surface Area|surface area]]. | [[Villi]] are small folds in the wall of the [[Small Intestine|small intestine]] that increase its [[Surface Area|surface area]]. | ||
| − | Singular [[Noun]]: '''Villus''' | + | : Singular [[Noun]]: '''Villus''' |
| − | Plural [[Noun]]: '''Villi''' | + | : Plural [[Noun]]: '''Villi''' |
===Adaptations of 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 a wall only one cell thick so the [[nutrient]]s only have a short distance to [[Diffusion|diffuse]] into the [[blood]]. |
| − | : [[Villi]] [[Capillary|capillaries]] inside them for a good blood supply to allow for quick [[diffusion]] 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]]. | : [[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]]. | + | : 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=== | ===About Villi=== | ||
: [[Villi]] cover inside of the [[Small Intestine|small intestine]]. | : [[Villi]] cover inside of the [[Small Intestine|small intestine]]. | ||
: [[Villi]] increase the [[Surface Area|surface area]] 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]] | ||
| + | |} | ||
| + | |||
| + | ==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 ''] | ||
Latest revision as of 15:16, 21 February 2020
Contents
Key Stage 3
Meaning
Villi are small folds in the wall of the small intestine that increase its surface area.
Adaptations of Villi
- Villi have a wall only one cell thick so the nutrients only have a short distance to diffuse into the blood.
- Villi have capillaries inside them for a good blood supply to allow for quick diffusion into the blood.
- Villi have a large surface area to allow quicker diffusion.
- The cells in the walls of the villi have microvilli to provide an even bigger surface area for quicker diffusion.
About Villi
- Villi cover inside of the small intestine.
- Villi increase the surface area of the small intestine.
 |
Key Stage 4
Meaning
Villi are small folds in the wall of the small intestine that increase its surface area.
Adaptations of Villi
- Villi have a wall only one cell thick so the nutrients only have a short distance to diffuse into the blood.
- Villi have capillaries in order to constantly supply enough fresh blood with few nutrients keeping a high concentration gradient between the food and the blood.
- Villi have a large surface area to allow quicker diffusion.
- The cells in the walls of the villi have microvilli to provide an even bigger surface area for quicker diffusion.
About Villi
- Villi cover inside of the small intestine.
- Villi increase the surface area of the small intestine.
|
References
AQA
- Villi, page 21, GCSE Combined Science; The Revision Guide, CGP, AQA
- Villi, page 24, GCSE Biology; The Revision Guide, CGP, AQA
- Villi, page 45, GCSE Combined Science Trilogy 1, Hodder, AQA
- Villi, page 59, GCSE Combined Science Trilogy; Biology, CGP, AQA
- Villi, page 65, GCSE Biology, CGP, AQA
- Villi, pages 15, 23, 39, GCSE Biology; Third Edition, Oxford University Press, AQA