How is food digested?

Food enters the stomach, is digested with gastric juice through oral chewing and adding enzymes in saliva, and is further digested with bile and pancreatic juice in the duodenum. When it passes through the small intestine, it absorbs nutrients, and then absorbs nutrients and water remaining in the large intestine, forming feces that are excreted through the colon and anus.

Salivary amylase produced by oral cavity can decompose starch into maltose, esophagus mainly plays the role of transportation, stomach is the main digestive organ, food is ground and pepsin is produced to decompose maltose into monosaccharide, gallbladder produces bile, and pancreas produces pancreatic juice, all of which are helpful for digestion. Small intestine mainly absorbs nutrients and produces phthalase to decompose peptides into amino acids and absorb them through active transportation.