intestine microvilli close up 3d render. gut microbiome and digestive system of human

intestine microvilli digestive gut intestinal medical bowel colon digestion epithelial tissue villi villus 3d small tract anatomy biology gastric gastrointestinal absorption duodenum lining epithelium health histology medicine science human microscopic mucosa system enterocytes stomach cancer surface cell lumen nutrients care anatomical absorptive enzymes large disease belly cholesterol render microbiome