Epithelium

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Author:
Anonymous
ID:
100892
Filename:
Epithelium
Updated:
2011-09-10 16:13:46
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Description:
Epithelium
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  1. Simple squamous - location
    • lining of bvs
    • lining of heart
    • lymphatic vessels
    • serosae
    • kidney glomeruli (Bowman's capsule)
  2. Simple cuboidal - location
    • kidney tubules (PCT)
    • ducts and secretory portions of small glands
    • ovary surface
  3. simple squamous - function
    • diffusion
    • filtration
    • reduces frictional surfaces
  4. simple cuboidal - function
    • secretion
    • absorption
  5. simple columnar - location
    • small bronchi
    • uterine tubes
    • some regions of the uterus
  6. simple columnar - function
    • absorption
    • secretion
  7. what cells are cilia found on? why?
    simple columnar - helps move substances through internal passageways
  8. stratified squamous - location
    • Keratinized: Forms the external part of the skin's epidermis
    • Non-keratinized: lines the esophagus, mouth, vagina
  9. stratified squamous - function
    protection of underlying areas subjected to abrasion
  10. stratified cuboidal - location
    • some sweat glands and mammary glands
    • RARE
  11. stratified columnar - location
    • pharynx
    • male urethra
    • lining some glandular ducts
    • transition areas between two other types of epithelia
  12. pseudostratified columnar epithelial - location
    • male sperm-carrying ducts (non-ciliated)
    • trachea (ciliated)
  13. pseudostratified columnar epithelial - function
    secretion and propulsion of mucus (via goblet cells)
  14. transitional epithelial - location
    • lines the urinary bladder
    • ureters
    • part of the urethra
  15. transitional epithelial - function
    stretches to permit the distension of the urinary bladder.
  16. simple squamous - nuclei characteristic
    disc-shaped, protrudes apically
  17. simple cuboidal - nuclei characteristics
    Spherical, central nuclei
  18. Simple columnar - nuclei characteristics
    oval nuclei located more towards the basal membrane
  19. pseudostratified columnar - nuclei characteristics
    seen at different layers
  20. def: neoplasm
    new growth
  21. def: benign
    nonmalignant neoplasm
  22. der: malignant
    uncontrollable growth and dissemination or recurrence after removal
  23. def: carcinoma
    malignant neoplasm derived from epithelial tissue
  24. def: adenocarcinoma
    a malignant neoplasm of epithelial cells in glandular or gland-like pattern
  25. ef: metastasis
    the appearance of neoplasms in parts of the body remote from the site of the primary tumor.
  26. What type of epithelial cells may be ciliated?
    • simple columnar
    • non-ciliated: digestive tract, gallbladder
    • ciliated: small bronchi, uterine tubes, some regions of the uterus
    • cilia help move substances through internal passageways

    • pseudostratified columnar:
    • non-ciliated: sperm-carrying ducts
    • ciliated: trachea
  27. What type of cells appear polygonal on a surface view?
    Simple cuboidal
  28. What type of cell is involved in gas exchange?
    simple squamous in the alveoli of the lung
  29. what type of cell lines the ventral surface of organs?
    simple squamous which makes up mesothelium.
  30. what type of cell asts as a lubricating membrane for the lung and heart?
    simple squamous
  31. What type of cell aids in absorption in the tubules in the renal cortex?
    simple cuboidal
  32. what type of cell aids in secretion in the salivary glands?
    simple cuboidal
  33. what type of cell aids in absorption in the gallbladder?
    simple columnar (non-ciliated)
  34. what type of cell aids in transportation and absorption with cilia, lining the lumen of the intestine?
    simple columnar (ciliated)
  35. What type of cell aids in protection and secretion, lining the vagina, esophagus, and mouth?
    stratified squamous (non-keratinized)
  36. what type of cell aids in protection in its keratinized form?
    stratified squamous - epidermis of the skin
  37. function of tight junctions
    • intercellular jucntions that maintain cell adhesion and communication between adjacent epithelial cells.
    • lateral surfaces
  38. function of occludin
    forms a belt around adjacent cells
  39. function of desomosomes
    these plaques are distributed along the lateral surface of adjacent epithelial cells, and maintani cell adhesion
  40. function of gap junctions
    • allows passage of aa, ions, and small proteins between adjacent cells (less than 1kDa).
    • Important in cardiac muscle, allowing movement of calcium ions.
  41. The lumen of the trachea is covered by what type of cell?
    pseudostratified ciliated columnar epithelium
  42. the lumen of the small intestine, gall bladder, and colon are covered with what type of cell?
    simple columnar epithelium
  43. the kidney tubular ducts are lined by what type of epithelium?
    simple cuboidal epithelium
  44. keratinized stratified squamous epithelium is found where?
    the skin
  45. non-keratinized stratified squamous epithelium is found where?
    mouth, esophagus, vagina
  46. What are papillae? Why are they important?
    • projections of the underlying connective tissue that carry nutrients up to the basement membrane separating the connective tissue from the epithelial tissue.
    • important because epithelial tissue does not contain blood vessels.
  47. the salivary glands contain what type of cells?
    stratified cuboidal and stratified columnar epithelium
  48. the lumen of the urinary bladder is composed of what type of epithelium?
    transitional epithelium

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