The Cheese Sandwich

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The cheese sandwich's journey begins when it is taken into the mouth, this process is ingestion. Whilst in the mouth, the large particles are broken down into much smaller particles, by chewing, which also mixes the food with saliva which contains a carbohydras enzyme. This amylase digests the starch in the sandwich to glucose. The saliva is produced in the three salivary glands. These are called, parotid, sublingual and submandibular. When the sandwich is swallowed, the food reaches the oesophagus. The reason why the food goes down the oesophagus rather than the windpipe is that a flap called the epiglottis drops over the windpipe stopping the sandwich particles from getting into the lungs. The oesophagus links the mouth and the stomach together, so the particles of the cheese sandwich enter the stomach organ next, where the food mixes with a protease enzyme which digests protein. The carbohydrates which were digested in the mouth were used in the human body for energy. There is high of starch content in the bread of the cheese sandwich. The carbohydrates are like a body fuel. Professional sportsmen and women need a diet high in carbohydrates because they are active and need energy. Protein, on the other hand which will be found in cheese is used for building cells. Proteins are vital for growth and to repair damaged areas of the human body. Hydrochloric acid is present in the stomach to kill bacteria. It has a low pH, and the enzymes produced by the stomach work best in acidic conditions. The food empties from the stomach into the duodenum where it is mixed with enzymes and salts produced by the liver and enzymes made in the pancreas. The pancreas secretes three main enzyme types: protease enzymes, carbohydrase enzymes and also lipase enzymes run into the duodenum at the top the small intestine, where it continues its journey. The fats in the sandwich,
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