Ans. The small intestine has a specialized structure called villi and microvilli, which increase its surface area for absorption. The inner lining of the small intestine is covered with finger-like projections called villi. Each villus contains blood vessels and lymphatic vessels called lacteals. When the digested food reaches the small intestine, nutrients like sugars, amino acids, and fatty acids are absorbed through the villi and enter the bloodstream or lymphatic system. The villi and microvilli provide a large surface area for efficient absorption of nutrients.