small intestine duodenum and vermiform appendix human under the microscope.

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