NEET BIOLOGY

Detailed explanation-1: -Adaptation of the ileum for absorption: Large surface area – due to being long and folded. Thin – digested food doesn’t have to travel far to reach the blood. Permeable – digested food can pass through easily. Good blood supply – to maintain the concentration gradient for diffusion between the ileum and bloodstream.

Detailed explanation-2: -The epithelial cells that cover each villus themselves have projections called microvilli . These all increase the surface area over which digested food – now simple molecules – is absorbed.

Detailed explanation-3: -The three adaptations of the small intestine are its long length (about 22 feet), presence of evaginations (folds) with villi, and presence of microvilli on the surface of villi. These adaptations increase the surface area of the small intestine which optimize chemical digestion and absorption processes.

Detailed explanation-4: -The lowest part of your small intestine is the ileum. This is where the final parts of digestive absorption take place. The ileum absorbs bile acids, fluid, and vitamin B-12.