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In the mouth, you have a pH of 7, in which amylase(the enzyme in saliva) works well with a pH near to 7. As you swallow the food, it gets passed into your stomach, which has a pH of 2. The low pH in the stomach helps digestion take place. Pepsin, the main enzyme in the stomach, works well with a pH of an acidic solution. Then the food gets passed into the small intestine. Here the pH is a slightly basic 8. The digestive fluids that surround the food, such as bicarbonate ion, work well in a slightly basic solution. The food has been split up into small enough molecules now and is ready to be passed absorbed into your bloodstream.

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13y ago

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