intestinal villi, mucosa intestinal. bacteria and microbes in intestines. microscopic villi and capillary. human

absorption absorptive bacteria belly bile bowel cancer care cells cholesterol closeup colon digestion digestive duodenum enterocytes enzymes epithelial epithelium gastric gastritis gastrointestinal gut health histology intestinal lining medical medicine microbestract microscopic microvilli minerals mucosa nutrients nutrition small stomach tissue tract ulcers villi villus