The colon is divided into 4 parts. Foreign objects in the anus and rectum. The pancreas also makes insulin, secreting it directly into the bloodstream. We do not endorse non-Cleveland Clinic products or services. Your digestive system is uniquely constructed to perform its specialized function of rectum and anus food into the energy you need to survive and rectum and anus the residue for waste disposal. Contents of the small intestine start out semi-solid, and end in a liquid form after passing through the organ. It has an inner ring of circular muscle fibres and an outer ring of long muscle fibres that surround the wall of the colon and rectum. Fiber will help prevent stool from tearing the anal skin and will helps the bowel movements rectum and anus out more easily. In the colon, bacteria break down food into smaller pieces.