The process of food entering the human body to being discharged.

Cardia-

Stomach, the stomach initially secretes acidic substances to digest food, and the food is mixed evenly in the stomach, which becomes indigestion-

Pyloris, when food stays in the stomach for a while, the pylorus will open-

Duodenum, bile and pancreatic juice are released into the duodenum after food reaches the duodenum of 12. These liquids contain a lot of digestive enzymes, which further digest food and absorb some nutrients-

The small intestine, including jejunum and ileum, is fully digested and absorbs almost all nutrients in the small intestine. Digestive juice includes bile and pancreatic juice from duodenum, and digestive juice secreted by small intestine glands. Nutrients are absorbed by intestinal epithelial cells and some water-

The large intestine includes cecum and colon, and there is appendix at the blind end of cecum. The function of the large intestine is to finally absorb food residues, but the large intestine mainly absorbs water, and then the food residues are finally decomposed into feces under the action of bacteria in the large intestine-

The rectum, the passage of feces-

Anal, poop out.