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: 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 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'''.