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Villi
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Villi (singular: '''villus''') are tiny, finger-like structures that protrude from the wall of the ) which protrude from epithelial cells lining villi. In all humans, the villi and microvilli together increase intestinal absorptive surface area 30-fold and 600-fold, respectively, providing exceptionally efficient absorption of Nutrient s in the Lumen . This increases the surface area of the intestine to around the area of a small parking lot or a tennis court. There are also Enzyme s on the surface for Digestion . Villus capillaries collect Amino Acids and simple sugars taken up by the villi into the blood stream. Villus Lacteal s collect absorbed fatty acids.

Villi expedite re-absorption in the small intestine.

They also share similarities with the Alveoi in the Lungs. Both increase the surface area of the body and help to absorb nutrients into the blood, through diffusion. The Alveoi; carbon dioxide out, oxygen in. Villi; glucose, fatty acids, amino acids, etc. in.