NEET BIOLOGY

Detailed explanation-1: -The lining of the small intestinal mucosa is very highly specialized for maximizing digestion and absorption of nutrients. The lining is highly folded to form microscopic finger-like projections called villi which increase the surface area to help with absorption.

Detailed explanation-2: -Finger-shaped structures called villi line the entire small intestine. They help absorb nutrients.

Detailed explanation-3: -The villi were predominantly tongue-shaped. In the duodenum they were also ridged, branched and folded, and in the jejunum they were also leaf-like and ridged. At places with lymph follicles, the surface of the ileum was rugged with meandering fold-like villi.

Detailed explanation-4: -They are most prevalent at the beginning of the small intestine and diminish in number toward the end of the tract. They range in length from about 0.5 to 1 mm (about 0.02 to 0.04 inch). The large number of villi give the internal intestinal wall a velvety appearance.

Detailed explanation-5: -The surface of the small intestine has a finger-like microscale villus structure, which provides a large surface area to realize efficient digestion and absorption.