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17 Cards in this Set
- Front
- Back
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What are the Four types of tissues? |
Epithelial, Connective, Muscular and Neural |
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Epithelial tissues _______ and _________ and form _________. |
"cover" and "line"
form Glands |
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What are the Functions of Epithelial Tissue? |
Provide Physical Protection: epithelia protect exposed & internal surfaces from abrasion, dehydration & destruction by chemical or biological agents. Control Permeability(absorption/secretion): any substance that enters or leaves the body must cross an epithelium. Most are capable of selective absorption or secretion. Sensation: Sense of touch Produce Secretions: Epithelial cells that produce secretions are called gland cells.
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In Glandular Epithelium.... |
most or all of the epithelial cells produce secretions, and those secretions are the primary function of the tissue |
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What are the Characteristics of Epithelial tissue? |
*Cellularity- formed of closely joined cells - in sheets *Polarity - 2 different surfaces Apical (exposed) - top - no blood supply Basal (attached) - bottom - always attached to connective tissue *Attachment- attached to connective tissue via basal lamina (basement membrane) *Avascular- lack blood vessels - dependent on blood of connective tissue *Regeneration- regenerate really fast
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Explain Microvilli |
Extensions of cell membrane on the apical surface which increase surface area for absorption (ex. Sm. Intestine) |
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Explain Cilia |
Hair like structures which beat to move a cell or to circulate fluids; move things up (ex. respiratory tract) |
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Epithelial tissues are classified by? |
Number of layers and the shape of the cells |
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The Layers of epithelial cells are: |
1.) Simple: one layer of cells
2.) Stratified: more than one layer of cells |
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The Shapes of Epithelial cells are: |
1.) Squamous: irregular shaped cells, like fried eggs 2.) Cuboidal: cube shaped 3.) Columnar: column shaped |
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What maintains the integrity of Epithelia? |
1.) intercellular connections 2.) attachment to basal lamina 3.) epithelial maintenance & repair |
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Intercellular Connections are:
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Anchor cell membranes
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Intercellular connections are held together via:
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Cell adhesion molecules (CAMs) and intercellular cement (the glue)
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Define CAMs
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Cell adhesion molecules. Protein molecules, anchor cell membranes
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What is intercellular cement?
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The glue that holds cells together, glycosaminoglycans (sticky sugars and proteins)-hyaluronan.
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Define Cell Junction
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Specialized areas in cell membrane (tight, gap, desmosomes)
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Impermeable, interlocking membrane proteins.
Form a barrier that isolates the Basolateral surfaces & deeper tissues from the contents of the lumen. |
Tight (Occluding) junctions
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