MARIS STELLA HIGH SCHOOL
SEC 3 PURE BIOLOGY
Topic 6 Nutrition in Mammals
T6.3 Absorption of Food & Functions of the Liver
Adaptations of Small Intestine for Absorption
It is very LONG, about 5-6 m.
This gives plenty of time for digestion to be completed, and fordigested food to be absorbed as it passes through.
It has very FOLDED surface. The inner wall is thrown into numerous folds & furrows. Thus the surface area for absorption is greatly enlarged.
It has minute finger-like projections (about 1 mm long) called villi covering the whole internal surface of the small intestine. (Each square millimemtre of surface has about 20-40 villi and there are about 5 million in the ileum.)
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*** The first section about the structure of villi etc is good. The section on absorption is much weaker and is the main reason this piece of work does not gain a 4 star rating. Little A level standard knowledge or understanding are shown and it lacks detail.