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Medicine LibreTexts

11.20: Absorption

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  • The small molecules produced by digestion are absorbed into the villi of the wall of the small intestine. The tiny finger-like projections of the villi increase the surface area for absorption. Glucose and amino acids pass directly through the wall into the blood stream by diffusion or active transport. Fatty acids and glycerol enter vessels of the lymphatic system (lacteals) that run up the centre of each villus.


    • Ruth Lawson (Otago Polytechnic; Dunedin, New Zealand)