The human gallbladder has the functions of storing bile, concentrating bile, secreting mucus and excreting bile. 1. Storage of bile: Bile is secreted by the liver and mainly stored in the gallbladder, from which it is discharged when it needs to be digested, and relieves the pressure of the biliary tract. 2. Concentration of bile: Bile contains a large amount of water and electrolytes. The mucous membrane of the gallbladder absorbs water and electrolytes to increase the concentration of bile, which can enhance the digestion of food. 3. secretion of mucus: the wall of gallbladder can secrete mucus to relieve the irritation of bile on the wall of gallbladder and avoid corrosion of the wall of gallbladder, which may cause cholecystitis. 4. Discharge of bile: After eating, food stimulates the duodenal mucosa, which stimulates the gallbladder to contract, and the gallbladder will discharge bile to help digest food. The gallbladder is an important digestive organ of the body, but prone to disease, it is recommended to eat a light diet, reduce the number of late nights, ensure adequate sleep, carry out appropriate exercise, enhance physical fitness, and protect the gallbladder.