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Tissue Level Of Organization (4.1 (The 4 Tissue Types (connective…

- - - - cover exposed surfaces, lines internal passage ways and chambers produces grandular secretions
    - - contracts to produce active movement
      - smooth muscle
        
        visceral
        
        hollow organs
      - cardiac muscle
        
        control heart and all heart muscles
      - skeletal muscle
        
        biceps
        
        triceps
        
        etc.
    - - conducts electrical impulses & Carries Information
      - cell body
      - dendrons
      - electrons
      - neuroglia cells
    - - dense irregular
      - dense regular
      - reticular
        
        bisecting or X's
      - Adipose
      - Areolar
        
        marshmellow
      - Fill internal spaces, provides structural support and supports energy
- - - - Physical Protection
      - control permeability
      - provide sensation exocrine
      - in bed onto surface of epithelium digestive tract sweat and milk
      - released into fluid or blood
    - - firmly attached to the basement membrane
      - if connections are damaged or broken then they become defective
      - hooked together by specialized transmembrane called cell adhesion molecules
    - - apicial surface
      - many epithelia that line internal passageways have microvilli on there exposed surfaces.
    - - lies between the epithelium and underlying connective tissues
      - must not only adhere to one another but remain firmly connected as well
    - - must continually make divide unspecialized cells known as stem cells or germative cells
- - - - Simple
        
        Simple-Consists of using one singular layer
        
        Simple Epithelium
        
        Thin, protects the basement membrane, fragile and cannot provide as much mechanical protection
      - Stratified
        
        Uses multiple layers and usually provides greater protection
        
        Greater protection for the basement membrane found in areas subject to mechanical or chemical stresses
    - - Squamous
        
        Squamous Epithelium
        
        Cells are thin and flat, Nucleus occupies the thickest portion of the cell
      - Cuboidal
        
        Cuboidal epithelium
        
        Little hexagon boxes when seen in three dimensions
        
        nuclei lie under each cell and form a neat row
      - Columnar
        
        Columnar epithelium
        
        Hexagonal but but taller and more slender resembling rectangles.
        
        nuclei are crowded close to basement membrane, height of epithelium is several times the distance between nuclei