Explain how the small intestine is adapted to its absorptive function (4)

The small intestine has many adaptions that help effective absorption to take place. Firstly it is very long, meaning there is a lot of time for nutrients to be absorbed. Secondly it has villi which are finger-like projections that increase the surface area for absorption. These villi are also covered in micro-villi further increasing surface area. The small intestine also has a good blood supply. Finally, villi walls are also only one cell thick, meaning nutrients do not have to travel far to be absorbed.