tissue of stomach under the microscope for education.

anatomy and background biology cardiac cell cells columnar cross digestive disease education eosin epithelial epithelium for gastric gastroenterology gastrointestinal gut health hematoxylin histology human intestinal intestine isolated lab lymph magnification medical microbiology micrograph microscope microscopic microscopy mucosa nerve organ physiology pits pylorus research rugae science section stomach surface system tissue tract under vessels wall white