The document summarizes the organs, enzymes, and chemical breakdown involved in digestion. The mouth breaks down starch into dextrin and maltose using salivary amylase. The stomach uses hydrochloric acid and pepsin to break polypeptides into peptides. The duodenum contains enzymes from the liver, pancreas, and intestines that further break down peptides, fats, and starches into smaller molecules that can be absorbed by the small intestine. Undigested material then passes to the colon for water absorption before excretion.