how do ulcers occur in alimentary canal
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pylori bacteria weaken the protective mucous coating of the esophagus, stomach, or duodenum, which then allows acid to get through to the sensitive lining beneath. Both acid and H. pylori irritate the lining and cause a sore (ulcer) to form.
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reason is due to the presence of bacteria helicobacter pylori. it occurs in the duodenum part of stomach. plz mark it as brainliest
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