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The Digestive System Food passes through the digestive system. Match the descriptions to each part. Note the first one has been done for you! Digestion begins here. Food is mechanically broken down by teeth. Saliva aids digestion. Mouth This produces bile. Bile has 2 functions –1) it neutralises stomach acid to allow enzymes in small intestine to work –2) it emulsifies fats Stomach Liver The thick muscular walls churn up the food and gastric juices are mixed with it. Microbes are killed here due to acidic pH. Excess water and salts are removed here. Small intestine Large intestine (The organs are not to scale) Miss Bradford 582730285 Digestion is completed here. Dissolved food is absorbed into the bloodstream. Inner surface has finger like projections called villi.