Correct: large surface area using 'villi' shapes, single cell thick to allow short diffusion distance between food to blood, Good blood supply to increase diffusion rate, many folds and protrusions to increase surface area 'villi', the surface area is around 250m2 that's the floor space of a size of a large house!, Incorrect: small surface area with flat surface, many cells between food and blood capillaries, few blood vessels nearby, smooth, uninterrupted flat surfaces with lower surface area to increase diffusion, The small intestines have the same surface area as 2 A4 sheets of paper,

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