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Epithelial Tissue (pg 2)

Epithelial Tissue (pg 2). Tissue = collection of cells that have similar structure and function together as a unit. Tissue = collection of cells that have similar structure and function together as a unit Histology = Study of tissues. Epithelial Tissues.

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Epithelial Tissue (pg 2)

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  1. Epithelial Tissue (pg 2)

  2. Tissue = collection of cells that have similar structure and function together as a unit

  3. Tissue = collection of cells that have similar structure and function together as a unit Histology = Study of tissues

  4. Epithelial Tissues • Form the covering of all body surfaces, line body cavities and organs, and form glands

  5. Epithelial Tissues • Form the covering of all body surfaces, line body cavities and organs, and form glands • Cells are tightly packed

  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. 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. 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. Shapes 1. Squamous = flat cells, thin nuclei

  10. Shapes • Squamous = flat cells, thin nuclei • Cuboidal = cubelike cells, spherical central nuclei

  11. Shapes • Squamous = flat cells, thin nuclei • Cuboidal = cubelike cells, spherical central nuclei • Columnar = Tall narrow cells, nuclei near bottom

  12. Number of Layers • Simple = 1 layer

  13. Number of Layers • Simple = 1 layer • Stratified = Multiple layers of cells. Named according to the type of cells at the free surface of the tissue

  14. Number of Layers • Simple = 1 layer • Stratified = Multiple layers of cells. Named according to the type of cells at the free surface of the tissue • Pseudostratified = appears to be multiple layers, but is really only 1 layer

  15. Glandular Epithelium • Exocrine glands = secrete products onto a surface via a duct

  16. Glandular Epithelium • Exocrine glands = secrete products onto a surface via a duct • Can be unicellular (goblet cells) or multicellular

  17. Exocrine Glands Classified according to STRUCTURE 1. Simple: duct has no branches 2. Compound: duct has branches

  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. Exocrine Glands Classified according to SECRETIONS 1. Merocrine: fluid released by exocytosis Example: salivary and pancreatic glands

  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. 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

  22. 1st Period: 8:40-9:40 2nd Period: 9:45-10:45 3rd Period: 10:50-11:50 LUNCH: 11:50-12:24 4th Period: 12:30-1:30 ASSEMBLY: 1:35-2:25 5th Period: 2:30-3:30

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