Food mixes with saliva in the mouth and the digestive break-down process. A person swallows their food, and from this point on, the eating process is involuntary. The chewed food enters the esophagus and contractions called peristalsis push it down into the stomach. It stores food until digestion begins. Gastric juices made up of enzymes and gastric acids break down the food into a substance called chyme, which is easier for the body to transport. This semifluid paste passes from the stomach to the small intestines, where the majority of digestion takes place.

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