simple columnar epithelium is a columnar epithelium that is uni-layered. in humans,

alveolus anatomy apocrine biological biology cell cells cilia columnar cytological cytology dermis digestive eosin epidermis epithelial epithelium gastrointestinal gland glands gut hematoxylin histological histology human hypodermis light medical medicine micrograph microscope microscopic microscopy mucosa mucosal myoepithelial paraffin photomicrograph pigment respiratory section skin sudor sudoriferous sudoripares sweat system tissue tract