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(Skin injuries and repair (skin is often bruised , scracted ,burned,ripped…

- - - - Pigment is gradually absorbed into the blood stream and the skin beings to look normal again
  - - - Cell fights off infection while skin cells try to repair the dermis and epidermis + scars may form if the cuts it large enough and the healing results in thick tissue fibers
  - - - Skin is taken from other parts of the body to help heal and treat the injured sections
- - - - ultra violet light activates a molecule in epedermis to produce vitamin D
        
        Vitamin D helps your body absorbs calcuim into your blood form food in your digestive track
    - - skin is used to regulate body temp
        
        blood vessels expand to realese heat and constrict to retain heat
        
        3 mill sweat glands , when blood vessels expand sweat moves out into the skin heat transfers to sweat , evaporates , and cools skin
- - - - outermost layer ,thinnest layer of skin
        
        chemical called melanin that can change your skin color
        
        lighter skin can burn easily and ca cause cancer
    - - directly below the epidermis
      - Thickest layer of the skin
      - contains blood vessels , nerves, muscles,
      - Below the dermis is the fatty layer where body fat is stored
    - - where all the fat is stored