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Tim K. Integumentary System (Skin (Epidermis (Function: (Protects dermis,…

- - - - Mechanical
      - Immune
    - - Excretion
      - Absorption
  - - - Stem Cells
        
        Basel Cells
      - Melanocytes
      - Merkel Cells
        
        Touch receptors (hairless skin only)
    - - Several cells thick
    - - Keratinocytes
      - Production of keratohyalin and keratin fibers
    - - Thick skin, protection
      - Location: palms of hand, Soles of feet
    - - Many Layers, dead cells, filled w/ kreatin
      - Water resistant but not water proof
    - - Protects dermis
      - prevents entry of pathogens
      - synthesizes vitamin D
      - Sensory receptors
      - coordinates immune system
  - - - Dermal Papillae
      - Capillaries
      - Tactile receptors
      - Function: Nourishes and Supports epidermis
    - - Structures
        
        Hair
        
        Glands
        
        nerves
        
        Blood Supply
      - Function:
        
        Protects against pathogens
        
        stores lipid reserves
        
        sensory receptors
        
        Thermoregulation
- - - - Produce hairs that protect skull
      - Hairs that provide touch sensation
    - - Shaft
      - Root
      - Hair Bulb
      - Hair Papilla
  - - - Assist in themoregulation
      - excrete waste
      - lubricate epidermis
    - - Function: secrete oily liquid, Lubracate's, provides antibacterial
      - Sebaceous Follicles: Secrete onto skin surface
      - Typical Sebaceous Glands: Secrete into hair follicles
    - - Function:
        
        Merocrine secretion
        
        flush epidermal surface
      - Apocrine Glands
        
        Axillae, Groin
        
        Smelly secretion
        
        Possibly used to comunicate
        
        Influenced by hormones
        
        Ceruminous Glands
        
        Mammary Glands
      - Merocrine Sweat Glands
        
        Widespread
        
        Produce thin secretion
        
        Controlled by nervous system
        
        important in thermoregulation