Difference between revisions of "Small Intestine"
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==Key Stage 3== | ==Key Stage 3== | ||
===Meaning=== | ===Meaning=== | ||
− | [[File:SmallIntestine.png|right|300px|thumb|A computer generated image showing the small intestine, large intestine, rectum and anus.]] | + | [[File:SmallIntestine.png|right|300px|thumb|A computer generated image showing the [[Small Intestine|small intestine]], [[Large Intestine|large intestine]], [[rectum]] and [[anus]].]] |
The '''small intestine''' is an [[organ]] in the [[Digestive System|digestive system]] which [[Absorb (Biology)|absorbs]] [[Nutrient|nutrients]] into the [[blood]]. | The '''small intestine''' is an [[organ]] in the [[Digestive System|digestive system]] which [[Absorb (Biology)|absorbs]] [[Nutrient|nutrients]] into the [[blood]]. | ||
− | === | + | ===Adaptations of The Small Intestine=== |
: The '''small intestine''' is a very long tube to give a large surface area to [[Absorb (Biology)|absorb]] [[nutrient]]s. | : The '''small intestine''' is a very long tube to give a large surface area to [[Absorb (Biology)|absorb]] [[nutrient]]s. | ||
: There is around 1kg of [[Bacteria in Digestion|bacteria]] inside the '''small intestine''' which helps [[digestion|digest]] the food. | : There is around 1kg of [[Bacteria in Digestion|bacteria]] inside the '''small intestine''' which helps [[digestion|digest]] the food. | ||
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: The [[Small Intestine]] is long and folded to increase the [[Surface Area|surface area]]. | : The [[Small Intestine]] is long and folded to increase the [[Surface Area|surface area]]. | ||
: The [[Small Intestine]] has structures called [[Villi]] which are extra folds in the surface to increase the [[Surface Area|surface area]]. | : The [[Small Intestine]] has structures called [[Villi]] which are extra folds in the surface to increase the [[Surface Area|surface area]]. | ||
− | : The [[blood]] supply to the [[villi]] | + | : The [[blood]] supply to the [[villi]] in the [[Small Intestine]] is very good in order to constantly supply enough fresh [[blood]] with few [[nutrients]] keeping a high [[Concentration Gradient|concentration gradient]] between the food and the [[blood]]. |
: There is around 1kg of [[Bacteria in Digestion|bacteria]] inside the '''small intestine''' which helps [[digestion|digest]] the food. | : There is around 1kg of [[Bacteria in Digestion|bacteria]] inside the '''small intestine''' which helps [[digestion|digest]] the food. | ||
: Only small [[molecule]]s can be [[Absorb (Biology)|absorb]]ed into the [[blood]] through the wall of the '''small intestine'''. | : Only small [[molecule]]s can be [[Absorb (Biology)|absorb]]ed into the [[blood]] through the wall of the '''small intestine'''. | ||
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+ | ===References=== | ||
+ | ====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 ''Small intestine, page 31, 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 ''Small intestine, page 45, GCSE Combined Science Trilogy 1, Hodder, AQA ''] | ||
+ | :[https://www.amazon.co.uk/gp/product/0008158754/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=0008158754&linkCode=as2&tag=nrjc-21&linkId=27ad53b0283feeff7fc5ae04a9e205f512 ''Small intestine, pages 93, 100-1, 103, GCSE Biology; Student Book, Collins, AQA ''] | ||
+ | |||
+ | ====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 ''Small intestine, pages 59, 63, 73, Gateway GCSE Biology, Oxford, OCR ''] |
Latest revision as of 14:44, 22 February 2022
Contents
Key Stage 2
Meaning
The small intestine is part of the digestive system.
Key Stage 3
Meaning
The small intestine is an organ in the digestive system which absorbs nutrients into the blood.
Adaptations of The Small Intestine
- The small intestine is a very long tube to give a large surface area to absorb nutrients.
- There is around 1kg of bacteria inside the small intestine which helps digest the food.
- There are digestive enzymes in the small intestine which break down large molecules into smaller molecules.
- Only small molecules can be absorbed into the blood through the wall of the small intestine.
Key Stage 4
Meaning
The small intestine is an organ in the digestive system which absorbs nutrients into the blood.
About The Small Intestine
- The Small Intestine is where food is broken down by digestive enzymes including amylase, protease and lipase before being absorbed into the blood.
- The Small Intestine produces some of its own digestive enzymes including amylase and peptidase but also takes some digestive enzymes from the pancreas including pancreatic amylase, trypsin and lipase.
- The Small Intestine is long and folded to increase the surface area.
- The Small Intestine has structures called Villi which are extra folds in the surface to increase the surface area.
- The blood supply to the villi in the Small Intestine is very good in order to constantly supply enough fresh blood with few nutrients keeping a high concentration gradient between the food and the blood.
- There is around 1kg of bacteria inside the small intestine which helps digest the food.
- Only small molecules can be absorbed into the blood through the wall of the small intestine.
References
AQA
- Small intestine, page 31, GCSE Biology; The Revision Guide, CGP, AQA
- Small intestine, page 45, GCSE Combined Science Trilogy 1, Hodder, AQA
- Small intestine, pages 93, 100-1, 103, GCSE Biology; Student Book, Collins, AQA