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Rov Loren Aniceto P.6 - Coggle Diagram

- - - - Blocks water/water-substances
      - Ex. Acetone, Poison, heavy-metals
      - Flat, dead, keratinized stratum corneum surround glycolypids
    - - Dendritic cells engulf antigens(Invaders)
      - Dermis contains macrophages
      - Epidermis contains phagocytic cells
      - Macrophages activates immune system
      - DNA absorb UV radiation
    - - Sebum & Defensins (Kill Bacteria
      - Melanin is barrier against UV
      - Sweat (Microbial Proteins)
  - - - Dermal Blood vessels constrict
      - Skin temp. drops
- - - - Dermal Papilae
        
        Sends finger-like signals to epidermis
      - Enhanced grip, sense of touch, fingerprints
      - Surface layer of areolar CT
    - - Course, dense CT
        
        Elastic fibers provide stretch recoil
        
        Collagen fibers provide strength & resilience
      - ECM contains pockets of adipose cells
      - 80% of dermal thickness
  - - - Interlaced with blood vessels & nerves
  - - - Cell appearance change
        
        Keratinization begins
        
        Slows water
      - Cells above die
        
        Too far from dermal capillaries
      - 4-6 cells, thick cells, flattened, layer is thin
    - - Found only in thick skin
      - Thin, translucent bands of 2-3 rows of dead kertinocytes
      - Cells change through apoptosis(controlled death)
    - - Kertinocytes appear skiey, prickley cells
      - Several layers thick
    - - Right above granular layer
      - 20-30 rows of anucleated keratinized dead cells
      - Accounts for 75% of epidermal thickness
      - Dead cells that rise can:
        
        Protect deeper cells from abrasion
        
        Prevent water loss
    - - cells die and moves up
      - 10-25% are melanocytes
      - Layer attached to Dermis