NEET BIOLOGY

Detailed explanation-1: -The middle part of your small intestine is the jejunum. The jejunum absorbs most of your nutrients: carbohydrates, fats, minerals, proteins, and vitamins. The lowest part of your small intestine is the ileum. This is where the final parts of digestive absorption take place.

Detailed explanation-2: -The small intestine is the most important absorbing organ in the GI tract. About 90% of nutrient absorption takes place in the small intestine.

Detailed explanation-3: -Virtually all nutrients from the diet are absorbed into blood across the mucosa of the small intestine. In addition, the intestine absorbs water and electrolytes, thus playing a critical role in maintenance of body water and acid-base balance.

Detailed explanation-4: -The ileum is the last and longest section of the small intestine. Here the walls of the small intestine begin to thin and narrow, and blood supply is reduced. Food spends the most time in the ileum, where the most water and nutrients are absorbed.

Detailed explanation-5: -The presence of small finger-like projections called villi in the duodenum aids in food absorption. The jejunum has an enterocyte cell lining that digests small nutrients with the help of digestive enzymes. The ileum aids in the absorption of bile salts, vitamin B12, and other byproducts.