Saliva also contains mucus which moistens food and makes it easier to move through the alimentary canal. Bile contains salts that break down fats in food. The liver makes bile and stores it in the gallbladder. When food is emptied into the duodenum from the stomach, the gallbladder releases bile that is mixed with the food. The gallbladder often fully contracts after a meal.
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Human Digestive System Functions
Benefits An optimally functioning digestive tract affords several benefits. One is that the acid in the stomach acts as a natural barrier to pathogenic infection, notes Thibodeau. Most bacteria and viruses are unable to survive the stomach, so this helps prevent food-related illness. Further, certain components of food, such as fiber, bind to ingested toxins.
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