What is the use of human gall: 1, storage of bile, concentrated bile, bile stored in the gallbladder, when the body needs to digest, and then discharged from the gallbladder, so the gallbladder is called the bile warehouse, but also played a role in buffering the biliary pressure, and the gallbladder has the function of concentrated bile. 2, secretion of mucus, the gallbladder mucosa can secrete thick mucus of about 20ml per day, can protect the biliary mucosa from concentrated bile erosion and dissolution. 3, emptying, the human body in 3-5 minutes after eating, food through the duodenum, stimulate the duodenal mucosa, produce a hormone called cholecystokinin, can make the gallbladder contraction, the gallbladder bile immediately into the duodenum, to help digestion and absorption of fat, in the discharge of bile at the same time, but also the bile tract bacteria with bile out of the body. Usually the gallbladder can be emptied after half an hour of eating fat.