Tissue

Card Set Information

Author:
hoyadavis
ID:
22018
Filename:
Tissue
Updated:
2010-06-04 15:20:25
Tags:
Lab tissue
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Description:
Epithelial cells and functions and connective cells and functions
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  1. List the four functions of epithelia
    • -Physical Protection
    • -Control permeability
    • -Provide Sensation
    • -Produce specialized secretions
  2. Epithelial cells that produce secretions are called ___ and make up ___ epithelium
    Gland cells; glandular
  3. Individual epithelial cells may be specialized for which 3 functions?
    • 1) The movement of fluids over the epithelial surface for protection and lubrication
    • 2) The movement of fluids throught the epithelium to control permeability
    • 3) The production of secretions that provide physical protection or act as chemical messengers
  4. List the characteristics of epithelia
    • 1) Cellularity- cells are bound together by cell junctions
    • 2) Polarity- has an exposed (apical) surface and a basal surface.
    • 3) Attachment to a pasal lamina
    • 4) Epithelia are avascular
    • 5) Epithelial cells are capable of rapid regeneration
  5. Epithelial cells are often divided into two function regions called the:
    Apical surface and the basolateral surface
  6. Microvilli are especially abundant on epithelial surfaces where ___ and ___ take place.
    Absorption and Secretion
  7. To be effective as a barrier, an epithelium must form a complete cover or lining. List three factos that help maintain the physical integrity of an epithelium
    • 1) intercellular connections
    • 2) attachment to the basal lamina
    • 3) epithelial maintenance and repair
  8. Cell junctions are:
    Specialized areas of the plasma membrane that attach a cell to another cell or to extracurricular materials.
  9. Three common types of cell junctions are
    • 1) occluding (tight) juctions
    • 2) gap junctions
    • 3) macula adherens
  10. The occluding (tight) junction functions to
    prevent the passage of water and solutes between the cells and isolate the contents of lumen from the basolateral surfaces.
  11. Gap Junctions are common among epithelial cells where
    the movement of ions helps coordinate functions.
  12. Macula adherens (desmosome) are found in locations subject to mechanical stress because
    they are strong and can resist stretching and twisting
  13. The two type of macula adherens are
    Spot desmosomes ( connected to bands of intermediate filaments) and hemidesmosomes (attaches a cell to extracellular filaments in the basal lamina.
  14. Lamina Lucida is:
    the superficial, clear lay of the basal lamina
  15. Lamina lucida acts as:
    a barrier that restricts the movement of proteins and other large molcues from the underlying connective tissue
  16. The dense layer is:
    the deep layer of the basal lamina
  17. The dense layer functions to:
    give strength to the basement membrane.
  18. Germinative (stem cells) are mostly located
    near the basal lamina

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