The large intestine consists of the cecum and colon. Large intestine begins in the right iliac region of the pelvis and it ends in the anus. The job of the large intestine is to absorb water from the remaining indigestible foods and send out the waste from the body.
The Large intestine absorbs vitamins synthesized by over 700 species of friendly bacteria present there.
The friendly bacteria in the large intestine break the undigested polysaccharides or fibers in diet and produces large amounts of vitamin K and Biotin (a B vitamin).
The large intestine, specifically the appendix contains several lymphoid tissues; it plays an important role in immunity. It acts against harmful bacteria and so prevents infection.