What substances are digested by gastric juice, bile and intestinal juice respectively?

Pepsin in gastric juice cuts off specific peptide bonds, thus digesting part of protein. Intestinal juice contains intestinal starch, maltose, fat and peptidase, so it digests sugars, lipids and dipeptides (protein). Bile Bile is secreted by liver cells and stored in gallbladder. When food enters the mouth, stomach and small intestine, it can reflexively cause gallbladder contraction, and bile flows into the duodenum through the common bile duct. L. There are no digestive enzymes in bile, and the main components are bile salts and bile pigments. The function of bile salt is to activate pancreatic lipase; Emulsifying fat into very fine particles can increase the contact area between fat and pancreatic lipase, which is beneficial to the digestion and absorption of fat; It can be combined with fatty acids and fat-soluble vitamins to form water-soluble complexes and promote the absorption of these substances by human body.