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

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