An ulcer in the gastrointestinal tract (e.g. esophagus, stomach, duodenum) caused in part by diminished protective mechanisms that shield the lining of the gastrointestinal tract from acids and pepsin in the gastric juice.
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The gastrointestinal system breaks down particles of ingested food into molecular forms by enzymes through digestion and then transferred to the internal environment by absorption. Find out more about these processes carried out by the gastrointestinal system through this tutorial...