| Term | Definition |
| lumen | free space in a blood vessel or something that is bordered by epithelium |
| apical | epithelial surface that lines free space |
| basal | epithelial surface that connects to underlying connective tissue |
| regeneration | chemotherapy inhibits this characteristic of epithelia |
| simple | single-layered epithelium |
| stratified | epithelium with multiple layers |
| apical | layer of epithelium that dictates the name of its shape |
| squamous | flat epithelial cells |
| cuboidal | regularly shaped epithelial cells with nuclei in the middle |
| columnar | epithelial cells that are rather tall |
| secretion | columnar epithelia have this function as opposed to others |
| endothelium | short name for simple squamous epithelium |
| diffusion | primary function of simple squamous epithelium that is not as pronounced in the others |
| simple squamous | epithelium in the alveoli of the lungs |
| mesothelium | one-word for epithelia that lines serous cavities, eg. peritoneal, pericardial etc. |
| simple cuboidal | kidney epithelium |
| filtration | primary function of simple cuboidal epithelium as opposed to the rest |
| protection | primary function of stratified epithelia as opposed to simple |
| simple columnar | epithelium in the digestive tube |
| pseudostratified columnar | epithelium in the trachea |
| pseudostratified | epithelium with nuclei all over the place |
| stratified squamous keratinized | epihelium in the epidermis |
| transitional | epithelium that allows stretching |
| transitional | epithelium in the bladder and ureter |
| keratin | protein that makes epithelium tough and waterproof |
| mucin | protein that makes up mucus |
| stratified columnar | epithelium in the penis |
| stratified cuboidal | epithelium in the salivary glands |
| simple columnar | epithelium that makes up exocrine glands |
| goblet cell | a unicellular exocrine gland |
| simple | exocrine glands with unbranched ducts |
| compound | exocrine glands with branched ducts |
| tubular | exocrine glands that look like tubes |
| alveolar | exocrine glands that look like sacs |
| tight junctions | outermost cell junctions in epithelium (common name) |
| zonula occludens | outermost cell junctions in epithelium (latin name) |
| adherens junctions | cell junctions in epithelium that reinforces tight junctions (common name) |
| zonula adherens | cell junctions in epithelium that reinforces tight junctions (latin name) |
| desmosomes | cell junctions that connects to cytoskeletons |
| gap junctions | cell junctions that are holes |
| gap junctions | cell junctions that allow cells to act as one whole unit |
| basal lamina | supporting layer of connective tissue under the epithelium |
| microvilli | these are used for increasing surface area for absorption |
| cilia | these propel something along epithelial cells |