the human gut

absorption alimentary anatomy anus appendix ascending bile biology bladder bowel caecum canal capillaries colon descending duodenum eating esophageal esophagus food gall git gut human ileum illustration intestine jejunum lacteal liver mastication medical microvilli mouth nasopharynx oesophageal oesophagus oropharynx pancreas pancreatic physiology rectum science sigmoid stomach transverse villi