Name the small finger-like projections that increase surface area for absorption in the small intestine.

• A. Crypts
• B. Villi
• C. Mucosa
• D. Plicae circulares

Answer: (B)

Villi are the small finger-like projections that line the inner surface of the small intestine and dramatically increase the area available for absorption. Each villus contains a network of capillaries and a central lacteal, so nutrients absorbed across the epithelium can quickly enter the blood or lymphatic system. These projections work with even smaller extensions called microvilli on the enterocytes to maximize contact with digested nutrients. The other features mentioned have different forms: crypts are gland-like invaginations between villi, mucosa is the lining itself, and plicae circulares are large circular folds that also increase surface area but aren’t finger-like projections.