OthersAcidosis during stress can reduce HCO3- in gastrointestinal mucosa cells, thus reducing the buffering capacity of mucosa to H+. At the same time, bile acids （　　　）, lysophosphatidylcholine and trypsin （　　　） in duodenal fluid flow back to the stomach, which can also lead to gastric mucosal damage when the protective factors of gastric mucosa are weakened during stress. In addition, the gastrointestinal mucosa is rich in xanthine oxidase, which can produce a lot of oxygen free radicals during ischemia-reperfusion, which can cause mucosal injury.