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Why Does the Stomach Not Get Digested Like the Foods We Eat?
All the food we consume will be digested in the stomach to then be channeled through the blood circulation throughout the body. How is food digested?
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Digestion of food starts from the mouth. While eating your food, chewing with your teeth, a lot of things are going on there. The saliva mixing with the food contains enzymes such as amylase that breaks down the carbohydrate content in the food.

The semi-digested food is then transported via the esophagus into the stomach where it is mixed with stomach acid and other enzymes. This breaks the food into small digestible pieces which is then circulated round the body system.

The stomach is lined by a mucous membrane called gastric mucosa. This forms a barrier between the food and the stomach.

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Digestion of food cycle start from the mouth and lastly goes to intestine in between various activity our body does such as chewing the food with the help of teeth in to small substances.

Digestion decreases the size of food particles until they are small enough to absorb into the cells of your intestine. Not all the food you eat is digestible, however. Some foods have a chemical structure incompatible with your digestive enzymes, while in other cases a gastrointestinal disorder may prevent you from completely breaking down the food you consume. Nonetheless, foods you can't digest can still benefit your health.

Digestion reduces proteins to amino acids, lipids to fatty acids and carbohydrates to sugars. It begins as you chew your food and continues in stages in your stomach and small intestine, where your food pieces get progressively smaller throughout the process. Digestion relies on the activity of digestive fluids, including digestive enzymes. These enzymes, produced by your salivary glands, stomach, pancreas and small intestine, are specific for different types of digestible foods. For example, some clip proteins into smaller fragments, others remove fatty acids from triglyceride molecules and some break down starches. Foods you can’t digest, on the other hand, pass through your gut without being reduced to their individual components.

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The stomach is lined with a special type of cell called epithial cells. Epithial cells produce mucus and the mucus forms a barrier between the contents in the stomach and the stomach lining. Certain enzymes produced by glands which aid digestion are not chemically activated until the enzymes pass through the mucus lining and mix with other digestive secretions.

source: https://www.theguardian.com/notesandqueries/query/0,5753,-1364,00.html

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