The  small  intestine  has a
   huge surface area and absorbs most ingested nutrients:
   1) circular folds are further folded into
   2) villi, which are lined with cells with folded membranes called
   3) microvilli.
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   Each 2) villus contains a network of
   a) blood vessels to transport amino acids and carbohydrates, and a
   b) lacteal vessel to transport fats.