The last end of small intestine (ileum) is connected with large intestine where ileocecal valve is located through which food passes in to large intestine from small intestine, but does not able to come back again in small intestine. It is about 1.5 m long tube like structure located from rectum to anus and wider than small intestine.
Digestion and absorption of food do not take place in large intestine. Food coming in the large intestine is present in liquid form and when it passes through large intestine, water is absorbed by its wall and becomes solid. Mucus secreting from mucus membrane of large intestine provides lubricants for forwarding wastes (faecal material). When rectum is filled with faecal material, a person starts feeling for toilet.