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Digestive system is to convert food into energy and convert waste into excretable material.

These are the only organs that we can see in the Structures of Digestive System: Mouth, Esophagus, Stomach, Pancreas, Large Intestine, Small Intestine, Rectum, and anus.

Ingestion is the process of eating food.

Absorption is the process of breaking down the food and preparing them for absorption through the intestinal wall and use by the cells.

Peristalsis is the final process in the digestive system which removes solid waste product in the form of fecal matter from the body.

Liver is a sac-like organ with strong muscular walls.

Duodenum is largely responsible for the continuing breakdown process. While the jejunum and ileum being mainly responsible for absorption of nutrients into the bloodstream. 

Appendix is a small tube attached to the

ascending colon.

Large intestine is a highly specialized organ that is responsible for processing waste so that defecation (excretion of waste) is easy and convenient.