Difference between revisions of "Villi"
(→Adaptations of Villi) |
|||
| Line 9: | Line 9: | ||
===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]]. | ||
| Line 23: | Line 23: | ||
==Key Stage 4== | ==Key Stage 4== | ||
===Meaning=== | ===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]]. | [[Villi]] are small folds in the wall of the [[Small Intestine|small intestine]] that increase its [[Surface Area|surface area]]. | ||
===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]] | + | : [[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]]. | : [[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]]. | ||
Revision as of 12:01, 5 June 2019
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 [nutrient]]s 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.
|