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For example, the large intestine is home to hundreds of bacteria that aid in absorption, excretion, and catalysis of undigested foods. There are also bacteria present in the small intestine that support break down of foods passed down from the stomach as well as nutrient absorption.
Description and Significance. Lactobacilli produce lactic acid and are used for many different things, including yogurt production and the maintenance of healthy intestinal microflora. Lactobacilli are commonly associated with the gastrointestinal tract of humans.escription and Significance. Lactobacilli produce lactic acid and are used for many different things, including yogurt production and the maintenance of healthy intestinal microflora. Lactobacilli are commonly associated with the gastrointestinal tract of humans.