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In what ways is the process of digestion a physical change?
When food is physically changed, mechanical digestion occurs. Food is broken into smaller parts and mixes continually with enzymes and other gastric juices. Mechanical digestion occurs in the mouth, stomach, and small intestine. Food is chemically changed in digestion when new, smaller substances are formed.
When the teeth chews the food. Food moves down the esophagus by the process of peristalsis .The stomach churns the food which breaks it into smaller pieces and mixes it with the gastric juices to produce a liquid called chyme. In the small intestine a process called segmentation the chyme sloshes back and forth between the segments of the small intestine.
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