histological sample simple columnar epithelium tissue under the microscope.

ampulla anatomy bile biology capillary cell cells ciliated collecting columnar common connective digestive duct eosin epithelium foveolar gastric gastrointestinal goblet gut hematoxylin histologic histological histology human intestinal intestine kidney lamina medical medullary microscope microscopic microscopy mucosa nephron photomicrograph pits propria section simple stain system tissue tissues tract tubular urinary villus