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Chapter 5 (5-2 skin color (Physiological factors (Carotene, Hemoglobin,…

- - - - air temperature exceeds body temp, thus heat is gained not lost
      - humid air decreases evaporation
  - - - limbs can withstand about 65F because they contain no vital organs
      - very dangerous if core body temp drops below 94F
- - - - bundles of collagen fibers
      - elastic fibers and reticular fibers which gave skin it's strength and resiliency.
      - Pacinian corpuscles - sensory receptors for deep pressure
  - - - composed of loose areolar CT
        
        Meissner's corpuscles - sensory receptor for light touch
        
        surface forms dermal papillae (finger-like projections into the epidermis) that form fingerprints in thick skin
- - - - stratum lucidum
        
        translucent layer cells
        
        extra layer only in thick skin of soles & palms
      - outermost layer
    - - is composed of 3-5 layers of flattened granular cells (filled with keratin granules);
    - - is composed of many layers of spiky cells with large nuclei
    - - innermost layer; directly above basement membrane
      - composed of a single row mitosing cuboidal epithelial cells and composed of melanocytes
      - specialized cells that produce the pigment melanin
- - - - Liver converts it into calcitriol
      - adds in absorption of calcium
      - weak flexible bones without it
  - - - most common form of skin cancer
      - originates in stratum germinitivum
    - - more superficial layers
      - metastasis seldom occurs for above cancers
    - - dangerous, usually begins as a mole
      - metastasize thru the lymphoid system
- - - - fat
      - cellular material
  - - - Structure
        
        ducts terminate in hair follicles
    - - Structure
        
        coil in deep dermis
        
        duct in dermis
        
        pore at surface