Carbohydrate digestion begins in the mouth and continues on into the small intestines. Explain the steps of carbohydrate digestion, including in your discussion why salivary amylase is nonfunctional in the stomach?
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Saliva contains salivary amylase, which begins the process of starch digestion in the mouth. In the mouth, starch is converted to the disaccharide, maltose. As the partially digested food and salivary juices reach the stomach, the low pH of the stomach, which is around 2.0, stops the activity of salivary amylase. Salivary amylase functions best at the nearly neutral pH of the saliva. As the partially digested food exits the stomach and moves into the small intestines, pancreatic juices containing sodium bicarbonate raise the pH to around 8.0. Pancreatic amylase digests any starch and the enzyme maltase hydrolyzes maltose to glucose.
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