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Epithelial tissue

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Epithelial tissue

  1. 1. Epithelial Tissue (pg 2)
  2. 2. Tissue = collection of cells that have similar structure and function together as a unit
  3. 3. Tissue = collection of cells that have similar structure and function together as a unit Histology = Study of tissues
  4. 4. Epithelial Tissues • Form the covering of all body surfaces, line body cavities and organs, and form glands
  5. 5. Epithelial Tissues • Form the covering of all body surfaces, line body cavities and organs, and form glands • Cells are tightly packed
  6. 6. Epithelial Tissues • Form the covering of all body surfaces, line body cavities and organs, and form glands • Cells are tightly packed • One free surface
  7. 7. Epithelial Tissues • Form the covering of all body surfaces, line body cavities and organs, and form glands • Tightly packed • One free surface • Avascular (no blood vessels)
  8. 8. Epithelial Tissues • Form the covering of all body surfaces, line body cavities and organs, and form glands • Tightly packed • One free surface • Avascular (no blood vessels) • Regenerate quickly
  9. 9. Shapes 1. Squamous = flat cells, thin nuclei
  10. 10. Shapes 1. Squamous = flat cells, thin nuclei 2. Cuboidal = cubelike cells, spherical central nuclei
  11. 11. Shapes 1. Squamous = flat cells, thin nuclei 2. Cuboidal = cubelike cells, spherical central nuclei 3. Columnar = Tall narrow cells, nuclei near bottom
  12. 12. Number of Layers 1. Simple = 1 layer
  13. 13. Number of Layers 1. Simple = 1 layer 2. Stratified = Multiple layers of cells. Named according to the type of cells at the free surface of the tissue
  14. 14. Number of Layers 1. Simple = 1 layer 2. Stratified = Multiple layers of cells. Named according to the type of cells at the free surface of the tissue 3. Pseudostratified = appears to be multiple layers, but is really only 1 layer
  15. 15. Glandular Epithelium • Exocrine glands = secrete products onto a surface via a duct
  16. 16. Glandular Epithelium • Exocrine glands = secrete products onto a surface via a duct • Can be unicellular (goblet cells) or multicellular
  17. 17. Exocrine Glands Classified according to STRUCTURE 1. Simple: duct has no branches 2. Compound: duct has branches
  18. 18. Exocrine Glands Classified according to STRUCTURE 1. Simple: duct has no branches 2. Compound: duct has branches 3. Tubular: gland has the same diameter as the duct 4. Acinar (Alveolar): gland is saclike
  19. 19. Exocrine Glands Classified according to SECRETIONS 1. Merocrine: fluid released by exocytosis Example: salivary and pancreatic glands
  20. 20. Exocrine Glands • Classified according to SECRETIONS 1. Merocrine: fluid released by exocytosis Example: salivary and pancreatic glands 2. Apocrine: small portion of cell is pinched off Example: Mammary glands
  21. 21. Exocrine Glands • Classified according to SECRETIONS 1. Merocrine: fluid released by exocytosis Example: salivary and pancreatic glands 2. Apocrine: small portion of cell is pinched off Example: Mammary glands 3. Holocrine: Cells fill with product and rupture Example: Sebaceous (oil) glands

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