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This is a detailed illustration of the human digestive system, with the following labels, (from left to right, anti-clockwise): tongue, mouth, teeth, trachea (to lungs), liver, gall bladder, bile duct, large intestine, colon, caecum, appendix, rectum, anus, small intestine, ileum, jejunum, duodenum, pancreas, stomach, pyloric sphincter, lower oesophageal sphincter, oesphagus, throat (pharynx), salivary glands.

 1.1 Opening out the human digestive system