Ключевые слова: absorption, anatomical, anatomy, appendix, bowel, cancer, cilia, ciliated, ciliated epithelium, colon, columnar epithelium, cross section, cytological, cytology, digestion, digestive, duodenum, epithelial, epithelial cells, epithelial tissue, epithelium, gastric tract, gastrointestinal, gut, histological, histology, intestinal, intestinal health, intestinal villus, intestine, intestines, large intestine, lymphoid follicle, medical, medicine, microbiology, micrograph, microscope, microscopic, microscopy, mucosa, nutrition, photomicrograph, pseudostratified, science, simple columnar epithelium, stomach, submucosa, tissue, tumor,