histoPP3.txt

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Author:
wooder32
ID:
35298
Filename:
histoPP3.txt
Updated:
2010-09-16 23:34:29
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PT623
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Dr. Turner PP3 it's on now
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  1. Groups of cells are held together by
    Cell to cell junctions and the binding of cells to the basal lamina
  2. Parenchyma and Stroma
    • Parenchyma is the epithelial layer of the inner organs/cells of an organ that provide function
    • Stroma is the supporting connective tissue of an organ. Support, structure, and protection of epithelial cells
  3. Functions of epithelium
    • Covering of body surfaces/Lining of body cavities
    • Secretion
    • Absorption
    • Sensation
    • Contractility
  4. Different cell shapes
    Squamous, Columnar, cuboidal
  5. Epithelium specializations
    cilia, microvilli, goblet cells, keratinization
  6. Types of layers of epithelium
    simple, stratified, pseudostratified
  7. functions of epithelium
    glandular, covering, secretory
  8. basal lamina
    separates epithelium from support tissues, identifies orientation of cells above. Diffusion barrier, cell differentiation and organization controller, pathway for migration during development/healing
  9. simple squamous epithelium location
    lung, blood vessels, lining of body cavities
  10. function of simple squamous epithelium
    active and passive transport of substances
  11. simple cuboidal location/function
    kidney/ovary/thyroid, secretion/active and passive molecule transport
  12. simple columnar function/location
    intestine/gallbladder, absorption/protection/secretion/lubrication
  13. function of stratified squamous keratinized
    they help in areas of high friction. They secrete, prevent water loss, protect. located in epidermis
  14. Stratified squamous non-keratinized location/function
    • areas subjected to repeated friction forces. (mouth, esophagus, vagina, anal canal)
    • protection/secretion/water loss prevention
  15. pseudostratified columnar location/function/specializations
    • intestines/respiratory epithelium
    • absoroption/secretion/protection/trap airborne particles
    • cilia, micovilli, goblet cells
  16. Goblet cells
    • mucus secreting epithelial cells
    • found in intestinal tract and respiratory tracts
  17. transitional epithelium function/location
    protects, distends to take on more liquid. (bladder, ureters) Facet cells change shape depending on distention
  18. biology of epithelial cells (innervation/renewal)
    • rich capillary beds and innervation from plexuses via lamina propria
    • cells are continuously renewed (slowly in liver/pancreas, quickly in epidermis/intestine)
  19. order of epithelial connections
    tight/occluding junctions, adhering belts, gap/communicating junctions, desmosomes, hemidesmosomes
  20. communicating junctions
    they use connexons to communicate inter-cellularly. Coordinated synchronized cell excitation
  21. occluding junctions
    tight junctions that seal off cells from molecules. Prevents diffusion
  22. hemidesmosomes/desmosomes
    attach cells to other cells (intermediate filaments) or extracellular matrix. Hemidesmosomes attach to basal lamina

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