The digestive enzymes are active in the mouth, stomach, pancreas, and walls of the small intestine. Food is first acted on by water and ptyalin, an enzyme produced by the salivary glands in the mouth It is here that the conversion of carbohydrates into simple sugars originates. Ptyalin mixes with the food being ground between our teeth and breaks apart large starch molecules into small molecules of simple sugar.
After being chewed, the food passes down the esophagus to the stomach, where it mixes w ih gastric juiccs containing the enzyme
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