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Life Science 1.4 : The Integumentary System
 

Life Science 1.4 : The Integumentary System

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    Life Science 1.4 : The Integumentary System Life Science 1.4 : The Integumentary System Presentation Transcript

    • Life Science : 1.4
      The Integumentary System
    • Objectives:
      List four functions of skin.
      Describe the two layers of skin.
      Describe the structure and function of hair and nails.
      Describe two kinds of damage that can affect skin.
    • Functions of Skin
      Integumentary system
      Organ system that forms a protective covering on the outside of the body.
      Made up of your skin, hair, and nails.
      Skin protects you by
      Keeping water in your body and foreign particles out of your body.
      Nerve endings in your skin let you
      Feel things around you.
      Skin helps regulate
      Your body temperature.
      Skin Also helps
      Get rid of waste chemicals in sweat.
      Melanin
      Determines color of skin
    • Layers of Skin
      Epidermis
      Outermost layer of skin.
      Most cells in the epidermis are dead.
      Thick as only 2 sheets of paper.
      Keratin
      Protein that makes skin tough.
      Dermis
      Thicker layer of skin that lies beneath the epidermis.
      Collagen
      Protein fibers giving skin strength.
    • Hair and Nails
      Hair helps
      Protect skin from ultraviolet light
      Regulate body temperature in most mammals.
      Keep particles out of eyes and nose.
      A hair forms at the bottom of a tiny sac called a hair follicle.
      Nails protect
      The tips of your fingers and toes.
      A nail grows from living cells in the nail rootat the base of the nail.
    • Skin Injuries
      Skin is often damaged, but fortunately can repair itself.
      However, damage to the genetic material in skin cells can cause skin cancer.