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Gut or the alimentary canal technically speaking is a long tube of variable diameter open at both the ends. It consists of mouth, mouth cavity, esophagus, stomach, small intestine, large intestine and anus. Ideally it works relentlessly and silently in a perfectly healthy body and mind. Rumblings in the gut indicate all is not well. Liver, pancreas and a large no. of microscopic glands are also associated with the alimentary canal.