The small intestine has finger-like projections called villi, which significantly increase the surface area for absorption, aiding in the efficient uptake of digested food.

Pancreatic juice, secreted by the pancreas, contains enzymes like trypsin for protein digestion and lipase for breaking down emulsified fats, enhancing the efficiency of digestion in the small intestine.

Bile juice, produced by the liver, makes the acidic food from the stomach alkaline, enabling pancreatic enzymes to work. It also acts on fats, breaking them into smaller globules for more efficient enzyme action.

The small intestine is the site where complete digestion of carbohydrates, proteins, and fats occurs. It receives secretions from the liver and pancreas to facilitate this process.