| A | B |
|---|
| Epithelial tissue | Covers organs, forms inner lining of body cavities, lines hollow organs |
| Simple squamous epithelium | Single layer of flattened cells |
| Simple cuboidal epithelium | Single layer of cube-shaped cells |
| Simple columnar epithelium | Single layer of cells that are taller than they are wide. |
| Pseudostratified columnar epithelium | Appears as many layers, but is actually only one layer of cells that all touch the basement membrane (not all reach the apical surface). |
| Keratinized stratified squamous epithelium | Many layers of cells, apical cells are flattened and contain only keratin (no nuclei). |
| Non-keratinized stratified squamous epithelium | Many layers of cells, apical cells are flattened with some of these containing nuclei. |
| Transitional epithelium | Many layers of cube-shaped and elongated cells; allows for stretch. |
| Location of simple squamous epithelium | Alveoli of lungs, lining of blood vessels |
| Function of simple squamous epithelium | diffusion, filtration, osmosis |
| Location of keratinized stratified squamous epithelium | Epidermis of skin |
| Function of keratinized stratified squamous epithelium | Protection, water resistance |
| Location of simple columnar epithelium | Lining of stomach, intestines |
| Function of simple columnar epithelium | Absorption (and secretion) |
| Function of transitional epithelium | Stretching |
| Location of transitional epithelium | Urinary bladder and ureters |
| Location of pseudostratified epithelium | Lining of trachea |
| Function of pseudostratifed epithelium | Protection; cilia mobilize mucus along apical surface |
| Function of simple cuboidal epithelium | Secretion (and absorption) |
| Location of simple cuboidal epithelium | Glands |
| Avascular | Absence of blood vessels. |
| Basement membrane | Membrane that connects the epithelial cells to the underlying connective tissues. |
| Desmosomes | Intercellular junction between two protein plaques held together by filaments. |
| Gap junctions | Intercellular junction between clusters of proteins that make a channel in the center and allow communication of materials in the cytoplasm of adjacent cells. |
| Goblet cells | Mucous secreting cells in simple columnar and pseudostratified columnar epithelia. |
| Simple epithelium | A single layer of epithelial cells. |
| Stratified epithelial | Several layers of epithelial cells. |
| Tight junction | Intercellular junction between solid proteins that allow no communication between adjacent cells. |
| Tissue | Collection of specialized cells that perform a specific function. |
| Hemidesmosomes | Junction that assists with attachment of epithelial cells to the underlying basement membrane. |
| Location of non-keratinized stratified squamous epithelium | Inner lining of mouth, esophagus, and vagina |
| Function of non-keratinized stratified squamous epithelium | Moist protective lining |
