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18 Cards in this Set
- Front
- Back
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simple squamous epithelium description
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single layer of flattened cells with disc-shaped central nuclei and sparse cytoplasm; the simplest of the epithelia
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simple squamous epithelium function
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allows passage of materials by diffusion and filtration in sites where protection is not important; secretes lubricating substances in serosae
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simple squamous epithelium location
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kidney glomeruli; air sacs of lungs; lining of heart, blood vessels, and lyphatic vessels; lining of ventral body cavity (serosae)
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simple cuboidal epithelium description
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single layer of cubelike cells with large, spherical central nuclei
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simple cuboidal epithelium function
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secretion and absorption
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simple cuboidal epithelium location
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kidney tubules; ducts and secretory portions of small glands; ovary surface
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simple columnar epithelium description
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single layer of tall cells with round to oval nuclei; some cells bear cilia; layer may contain mucus-secreting unicellular glands (goblet cells)
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simple columnar epithelium function
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absorption; secretion of mucus, enzymes, and other substances; ciliated type propels mucus (or reproductive cells) by ciliary action
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simple columnar epithelium location
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nonciliated type lines most of the digestive tract (stomach to anal canal), gallbladder, and excretory ducts of some glands; ciliated variety lines small bronchi, uterine tubes, and some regions of the uterus
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pseudostratified columnar epithelium description
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single layer of cells of differing heights, some not reaching the free surface; nuclei seen at different levels; may contain mucus-secreting cells and bear cilia
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pseudostratified columnar epithelium function
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secretion, particularly of mucus; propulsion of mucus by ciliary action
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pseudostratified columnar epithelium location
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nonciliated type in male's sperm-carrying ducts and ducts of large glands; ciliated variety lines the trachea, most of the upper respiratory tract
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stratified squamous epithelium description
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thick membrane composed of several cell layers; basal cells are cuboidal or columnar and metabolically active; surface cells are flattened (squamous); in the keratinized type, the surface cells are full of keratin and dead; basal cells are active in mitosis and produce the cells of the more superficial layers
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stratified squamous epithelium function
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protects underlying tissues in areas subjected to abrasion
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stratified squamous epithelium location
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nonkeratinized type forms the moist lining of the esophagus, mouth, and vagina, keratinized variety forms the epidermis of the skin, a dry membrane
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stratified cuboidal epithelium description
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generally two layers of cubelike cells
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stratified cuboidal epithelium function
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protection
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stratified cuboidal epithelium location
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largest ducts of sweat glands, mamamary glands, and salivary glands
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