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It is long enough to provide sufficient time for absorption. It's surface area is also increased as its inner walls have many folds and have many small finger-like projections called villi and the epithelial cells of villi have many microvillis.

thirfly, the villi have walls or membranes that are only one-cell think and lastly. the villi are richly supplied with blood cappilaries and lymphatic vessels (lacteals that carry away absorbed nutrients like fats . each lacteal in each villus is also surrounded by blood capillaries that transport glucose and amino acids away from the small intestine.

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