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16 Cards in this Set
- Front
- Back
Epithelial Tissue (Epithelium): What are the two main types and their location?
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(1) Covering and lining epithelia {On external and internal surfaces} (2) Glandular epithelia {Secretory tissue in glands}
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What are some of the characteristics of the Epithelial Tissue?
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(1) Cells have polarity—apical (upper, free) and basal (lower, attached) surfaces (2) Are composed of closely packed cells (3) Supported by a connective tissue reticular lamina (under the basal lamina) (4) Avascular but innervated (nervess) (5) High rate of regeneration
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(1) What makes up a simple epithelium? (2) What makes up a stratified epithelium?
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(1) one layer (2) More than one layer
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What are three types of/or classification of Epithelia?
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(1) Squamous (2) Cuboidal (3) Columnar
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What is the description, function and location of: Simple squamous epithelium
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[Description]: Single layer of flattened
cells with disc-shaped central nuclei and sparse cytoplasm; the simplest of the epithelia. [Function]: Allows passage of materials by diffusion and filtration in sites where protection is not important; secretes lubricating substances in serosae. |
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What is the description, function and location of: Simple cuboidal epithelium
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[Description]:Single layer of
cubelike cells with large, spherical central nuclei.[Function]:Secretion and absorption.[Location]:Kidney tubules; ducts and secretory portions of small glands; ovary surface |
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What is the description, function and location of: Simple columnar epithelium
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[Description]: Single layer of tall cells
with round to oval nuclei; some cells bear cilia; layer may contain mucus- secreting unicellular glands [Function]: Absorption; secretion of mucus, enzymes, and other substances;ciliated type propels mucus (or eproductive cells) by ciliary action. [Location]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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What is the description, function and location of: Pseudostratified columnar epithelium
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[Description]: 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.[Function]:Secretion, particularly of mucus; propulsion of mucus by ciliary action.[Location]: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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What is the description, function and location of: Stratified squamous epithelium
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[Description]: 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 [Function] Protects underlying tissues in areas subjected to abrasion [Location] Nonkeratinized type forms the moist linings of the esophagus,mouth, and vagina; keratinized variety forms the epidermis of the skin, a dry membrane. |
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Name some traits of: Epithelia: Stratified Cuboidal
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(1) Quite rare in body (2) Found in some sweat and mammary glands
(3) Typically two cell layers thick |
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Name some traits of: Epithelia: Stratified Columnar
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(1) Limited distribution in body (2) Small amounts in pharynx, male urethra, and lining some glandular ducts (3) Also occurs at transition areas between two other types of epithelia
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What is the description, function and location of: Transitional epithelium
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[Description]: Resembles both
stratified squamous and stratified cuboidal; basal cells cuboidal or columnar; surface cells dome shaped or squamouslike, depending on degree of organ stretch. [Function] Stretches readily and permits distension of urinary organ by contained urine.[Location] Lines the ureters, urinary bladder, and part of the urethra. |
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What is a gland?
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One or more cells that makes and secretes an aqueous fluid
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How is the Glandular Epithelia classified?
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(1) Site of product release (2) Relative number of cells forming the gland
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(1) What is the description of the Endocrine gland? (2) What does it do?
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(1) Ductless glands (2) Secrete hormones that travel through lymph or blood to target organs
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What is the description of the Exocrine gland?
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(1) More numerous than endocrine glands (2) Secrete products into ducts (3) Secretions released onto body surfaces (skin) or into body cavities (4) Examples include mucous, sweat, oil, and salivary glands
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