The characteristic folds of the lining of the small intestine allow for increased surface area to promote absorption. Another aspect of the intestinal lining that increases surface area is the presence of

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The characteristic folds of the lining of the small intestine are called circular folds or plicae circulares. These folds increase the surface area of the small intestine. In addition to the circular folds, the small intestine has finger-like projections called villi. Villi also increase the surface area for absorption. Each villus contains many cells that have microvilli, which are tiny hair-like projections. Microvilli further increase the surface area available for nutrient absorption. Therefore, both villi and microvilli increase surface area, so the best choice is E.

The Characteristic Folds of the Lining of the Small Intestine