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What happens to our food after we eat it? Step 1: Mouth • Mechanical digestion starts when we bite and chew our food • Chemical digestion starts as saliva (enzymes) start to break down the food further Step 2: Stomach • After you swallow, the food travels down the pharynx and esophagus to the stomach. • Mechanical digestion happens as the stomach muscles contract and squeeze the food • Chemical digestion happens as stomach acid further breaks down the food into nutrients Step 3: Small Intestine • The liquefied food (chyme) moves from the stomach into the small intestine. • It mixes with chemicals from the pancreas that make it less acidic. Beginning of small intestine/ pancreas Nutrients absorbed • The nutrients are absorbed into the bloodstream through the walls of the small intestine (villi). Step 4: Large Intestine • The water is absorbed by the large intestine • This creates solid waste…feces Problems with the large intestine • Diarrhea: When the large intestine does not remove enough water from the waste • Constipation: When the large intestine removes too much water from the waste