6.1.1 - The contraction of circular and longitudinal muscle of the small intestine mixes the food with enzymes and moves it along the gut.
6.1.4 - Villi increase the surface area of epithelium over which absorption is carried out.
6.1.5 - Villi absorb monomers formed by digestion as well as mineral ions and vitamins.
6.1.6 - Different methods of membrane transport are required to absorb different nutrients.

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