The human gastrointestinal tract is the stomach and intestine, sometimes including all the structures from the mouth to the anus. (The “digestive system” is a broader term that includes other structures, including the accessory organs of digestion). In an adult male human, the gastrointestinal (GI) tract is 5 metres long in a live subject, or up to 9 metres without the effect of muscle tone, and consists of the upper and lower GI tracts.
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American scientists conducted a study that showed that gastroesophageal reflux disease, one of the manifestations of which is heartburn, is associated with a high risk of developing cancer of the larynx and...