Ch 4

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Ch 4
2012-09-06 01:29:04

Ch 4
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  1. Name the Four Tissue Types
    *Epithelial Tissue[ep-uh-thee-lee-uhm]

    *Connective Tissue

    *Muscle Tissue

    • *Nervous Tissue
  2. Extracellular Matrix
    • *substance produced by cells of a specific tissue
    • (Protein fibers, salts, h2o and dissolved macromolecules)

    *located outside of cells
  3. Epithelial Cell Layers[ep-uh-thee-lee-uh]

    Simple/Stratified/Pseudostratified(pseu·do·strat·i·fi·ca·tion)  Epithelium
    Simple Epithelium-single layer of cells,apical surface, attached to basement membrane

    Stratified Epithelium-2 or more layers of cells, not all cells have an apical surface or basement membrane

    • Psuedostratified Epithelium-single layer but not all cells reach their nuclei give the appearance of multilayered&stratified...but they aren't
  4. Epithelial Cell Shapes

    *Squamous-flattened,fried egg

    *Cuboidal-nucleus centrally located

    • *Columnar-taller than wide, nucleus is oval & located in the basal region of the cell 
  5. *Glands
    *mucin, hormones, enzymes, waste products

    *endocrine- glands DO NOT possess ducts and secrete directly into the bloodstream,

    • *exocrine-glands Do possess ducts and their cells secrete to products to their ducts; almost all exocrine glands are derived from epithelial tissue
  6. Connective Tissue
    Function & Examples
    *Most diverse, abundanct, widely distributed and structurally vaired of all four tissue types

    *Function is to "connect" one structure to another

    *CT is the "glue" and "filler" of the boddy

    *Tendons, ligaments, body fat, bones and cartilage
  7. Functions of Connective Tissue
    *Physical Protection

    *Support and structural framework



    *Immune Protection

    *Development of CT

    *Arises from mesoderm
  8. Two Types of Embryonic[em-bree-on-ik] CT
    *Mesenchyme-source of all adult CT

    *Mucous-found in umbilical cord& can contain stem cells for future use by the individual
  9. Connective Tissue can be classified into 3 broad categories....
    *CT proper

    *Supporting CT

    *Fluid CT
  10. Two groups of Cells in Connective Tissue Proper:
    Resident Cells & Wandering Cells
    *Ressident Cells: fibroblasts,adipocytes,fixed macrophages and mesenchymal cells

    *Wandering cells: mast and plasma cells, free macrophages and leukocytes
  11. Define Collagen Fibers
    • long, unbranching, strong, flexible and resistant to stretching.
    • 25% of all protein in the human body, making collagen the most abundant protein
  12. Define Elastic Fibers
    thinner than collagen, stretch easily, branch and rejoin. 
  13. Define Reticular Fibers
    Thinner than collagen fibers, form a meshwork-like congiguration. They are found in organs with abundant spaces such as liver, lymph nodes and spleen