The human gastrointestinal (GI) tract, or alimentary system, is a single tube approximately nine metres long when relaxed, though shorter in life because. LOGIN / FREE TRIAL ... Gastrointestinal Tract ...

The upper GI tract includes the esophagus, stomach, and duodenum—the first part of the small intestine. Written by : Vasudha Bhat Updated at: Jul 24, 2014 00:00 IST ...

The two muscle layers in the walls of the pharynx (see NT Clinical, 7 February, p26, for a description of the layers of the lumen of the gastrointestinal tract) contract alternately and the resultant ...