Well, no structure absorbs nutrients as they just dissolve into the blood after they have been broken down into smaller soluble molecules from larger insoluble molecules by enzymes.
Hope this helped (though it may not have).
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The small intestines. The small intestines are lined with epithelial tissues which have microvilli or finger like projections. There are also hair like structures called villi. Microvilli and villi increase the surface area available to absorb nutrients.