HUMAN NUTRITION

Detailed explanation-1: -The jejunum is a major site for absorption of the vitamin folic acid and the end of the ileum is the most important site for absorption for the vitamin B12, and bile salts.

Detailed explanation-2: -The small intestine has a vast interior surface area, which makes it good for absorption. This is created by the plicae circulares, which project numerous microscopic tissue structures that resemble fingers and are known as villi.

Detailed explanation-3: -The majority of nutrients are absorbed in the second and third parts of the small intestine, called the jejunum and the ileum.

Detailed explanation-4: -The food that is digested is absorbed into the blood vessels in the walls of the intestine. The finger-like projections known as villi, drastically increase the surface area of the small intestine for greater absorption of the digested food. The blood carries the absorbed food material to different parts of the body.