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→About The Small Intestine
==Key Stage 3==
===Meaning===
[[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]].
===About 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.
: There is around 1kg of [[Bacteria in Digestion|bacteria]] inside the '''small intestine''' which helps [[digestion|digest]] the food.
: There are [[Digestive Enzyme|digestive enzyme]]s in the '''small intestine''' which break down large [[molecule]]s into smaller [[molecule]]s.
: Only small [[molecule]]s can be [[Absorb (Biology)|absorb]]ed into the blood through the wall of the '''small intestine'''.
==Key Stage 4==
===About The Small Intestine===
: The [[Small Intestine]] is where food is broken down by [[Digestive Enzyme|digestive enzymes]] including [[amylase]], [[protease]] and [[lipase]] before being [[Absorb (Biology)|absorbed]] into the [[blood]].
: The [[Small Intestine]] produces some of its own [[Digestive Enzyme|digestive enzymes]] including [[amylase]] and [[peptidase]] but also takes some [[Digestive Enzyme|digestive enzymes]] from the [[pancreas]] including [[Pancreatic Amylase|pancreatic amylase]], [[trypsin]] and [[lipase]].
: 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 [[blood]] supply to the [[villi]]s in the [[Small Intestine]] is very good in order to constantly supply enough fresh [[blood]] with little 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.
: Only small [[molecule]]s can be [[Absorb (Biology)|absorb]]ed into the [[blood]] through the wall of the '''small intestine'''.
===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 '']