#rectum  the terminal section of the alimentary canal; from the sigmoid flexure to the anus
  supertype:  body_part  any part of an organism such as an organ or extremity
  part:  rectal_artery  anus
  part of:  large_intestine__largeintestine  beginning with the cecum and ending with the rectum; includes the cecum and the colon and the rectum; extracts moisture from food residues which are later excreted as feces
     part of:  alimentary_canal__alimentary_tract__digestive_tube__digestivetube__digestivetract__gastrointestinal_tract__GI_tract  tubular passage of mucous membrane and muscle extending about 8.3 meters from mouth to anus; functions in digestion and elimination
        part of:  digestive_system__digestivesystem__gastrointestinal_system__systema_alimentarium__systemaalimentarium__systema_digestorium__systemadigestorium  the system that makes food absorbable into the body
           part of:  body__organic_structure__organicstructure__physical_structure  the entire physical structure of an organism (especially an animal or human being); "he felt as if his whole body were on fire"

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