structure of colon villi

absorption anatomy arteries background bowel cancer cell circular closeup colon detail diagram digestion digestive disease epithelium esophagus gastric gastrointestinal gut health healthcare healthy human ileum illustration internal intestinal intestine intestines longitudinal lymphatic medical medicine microscopy microvilli mucosa mucosae mucous muscularis nerve nobody oesophagus organ physiology science section small stomach structure system systemic tissue tract vector veins villi villus