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B3.1.7 Exchange in the gut
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biology (B3.1) Mind Map on B3.1.7 Exchange in the gut, created by elliesussex on 05/12/2013.
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b3.1
biology
b3.1
Mind Map by
elliesussex
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elliesussex
over 11 years ago
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Resource summary
B3.1.7 Exchange in the gut
Villi line the inner surface of the small intestine and are the exchange surface for food molecules.
Villi have good blood supply and increase the surface area greatly.
Gut digests food into small, soluble molecules.
In small intestines, these solutes are then absorbed into blood.
Villi have:
single layer of surface cells
Many capillaries close to the wall to aid absorption
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