Term
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Definition
| Groups of cells similar in structure that perform common or related function |
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Term
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Definition
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Term
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Definition
| Epithelial, Connective, Muscle, Nerve |
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Term
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Definition
| Tissue is fixed (preserved), has to be cut thinly to transmit light, staining enhances contrast |
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Term
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Definition
| Forms boundaries, two main types: Covering and lining epithelia (on external and internal surfaces), and Glandular epithelia (secretory tissue in glands) |
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Term
| Epithelial Tissue Functions |
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Definition
| Protection, absorbtion, filtration, excretion, secretion, sensory reception |
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Term
| Five Characteristics of Epithelial Tissues |
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Definition
| Polarity, specaialized contacts, supported by connective tissues, avascular (but innervated), and can regenerate |
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Term
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Definition
Cells have polarity;
-Apical surface (upper free) exposed to exterior or cavity
-Basal surface (lower, attached)
-Both surfaces differ in structure and function |
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Term
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Definition
-May be smooth and slick
-Most have microvilli (brush border of intestinal lining)...increase surface area
-Some have cilia (lining of trachea) |
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Term
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Definition
Noncellular BASAL LAMINA
-Glycoprotein and collagen fibers lies adjacent to basal surface
-Adhesive sheet
-Selective filter
-Scaffolding for cell migration in wound repair |
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Term
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Definition
-Covering and lining epithelial tissues fit closely together
-form continous sheets
-Specialized contacts bind adjacent cells
-Lateral contacts
-Tight junctions
-Desmosomes |
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Term
| Connective Tissues Support |
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Definition
-All are supported by connective tissue
-RETICULAR LAMINA
-deep to BASAL LAMINA
-Network of collagen fibers
-BASEMENT MEMBRANE
-Basal lamina + reticular lamina
-Reinforces epithelial sheet
-Resists stretching and tearing
-Defines epithelial boundary |
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Term
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Definition
-No blood vessels in epithelial tissue
-Must be nourished by diffusion from underlying connective tissues
-Is supplied by nerve fibers |
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Term
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Definition
-High regen capacity
-Stimulated by loss of apical-basal polarity and lateral contacts
-some exposed to friction
-some exposed to hostile substances
-If adequate nutrients can replace lost by cell division |
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Term
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Definition
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Term
| Shapes of Stratified Epithelial Tissues |
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Definition
Squamous (flattened/scale like)
Cuboidal Cells (box, round nucleus)
Columnar cells (tall, column shape, enlogated nucleus) |
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Term
| Classification of Simple Epithelia |
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Definition
| Absorbtion, secretion, filtration, very thin |
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Term
| Simple Squamous Epithelium |
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Definition
| Allows materials to pass by diffusion and filtration in sites where protection is not important; secretes lubricating substances in serosae. |
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Term
| Location of Simple Squamous Epithelium |
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Definition
Endothelium
The lining of lymphatic vessels, blood vessels, and heart
Mesothelium
The epithelium of serous membranes in the ventral body cavity |
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