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chapter 4 (4.2 (epithelial characteristics (avascular (no blood vessels),…

- - - - provide protection
      - control permeavility
      - sproduce secretios
  - - - single layer of cells covering basement membrane
      - very thin and fragile
      - where absorption occurs
  - - - thin and flat, nucleus occupies the thickest part.
      - cells look like rigged fried eggs
    - - resemble hexagonal boxes, but also appear square
    - - hexagonal, tall, slender
  - - - no blood vessels
- - - - secrete poducts into a duct which opens into
        
        an external surface (ex- sweat gland)
        
        internal space
      - unicellular
        
        goblet cells
      - multicellular
        
        simple (unbranched)
        
        compound (branched)
        
        tubular (tube-like)
        
        alveolar (sac-like)
      - 3 types of secretions
        
        merocrine
        
        secrete fluid thorugh acell membrane into a duct with no loss of glandular cells
        
        ex- salivary glands
        
        apocrine
        
        lose small portion of cells with secretion
        
        ex- mammary glands
        
        halocrine
        
        release entire cells into secretion
        
        ex- oil glands on skin
    - - secrete horomones into blood, these glands are ductless
- - - - mouth, throat, vagina, anus
    - - skin
- - - - air sacs of lungs (alveoli)
      - liing capillaries
      - lining body cavities
      - covering ventral organs