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===Meaning===
[[File:SmallIntestine.png|right|300px|thumb|A computer generated image showing the small 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 The Small Intestine===
: The '''Small Intestinesmall intestine''' is a very long tube to give a large surface area to [[Absorb (Biology)|absorb nutrients]] [[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]]ed into the blood through the wall of the '''small intestine'''.
==Key Stage 4==
===Meaning===
The '''small intestine''' is an [[organ]] in the [[Digestive System|digestive system]] which [[Absorb (Biology)|absorbs]] [[Nutrient|nutrients]] into the [[blood]].
===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]] 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 is very good to constantly supply [[blood]] with little [[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'''.