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The Human Body
Integumentary System



Integumentary System
Reading Level
     edHelper's suggested reading level:   grades 5 to 8
     Flesch-Kincaid grade level:   5.18

Vocabulary
     challenging words:    soles, disease-causing, helping, perspiration, trapping, substance, organism, melanin, maintain, dermis, epidermis, ultraviolet, outer, cancer, leading, covering


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Integumentary System
By Cindy Grigg
  

1     Your skin is a flexible, protective organ that covers your body. An organ is a structure in an organism that is made of two or more different tissues which has a specialized function or job. If it were stretched out, an adult's skin would be about 16 square feet and weigh about 6 pounds. That's about the size of a mattress on a twin bed. Skin is the largest organ in the human body. It amounts to about 7% of your body weight. You might think your skin is just a covering, but skin has many important jobs. Your skin is also called the integumentary system.
 
2     Just as packaging protects foods, your skin is your body's protective "wrapper." Your skin has two layers. The epidermis is the outer layer. It is about as thick as seven sheets of paper. The epidermis has some nerve cells but no blood vessels. This outer skin layer produces fingernails, toenails, and hair. The epidermis is thickest on your palms and the soles of your feet. Your eyelids have the thinnest skin layers of all. The epidermis continuously makes new skin cells to replace old ones. Old ones on the skin's surface are worn off or washed away, exposing new cells. You grow a complete new layer of skin about every twenty-seven days.
 
3     Below the epidermis is the layer called the dermis. In the dermis layer are nerves, glands, hair follicles, and blood vessels. When you scrape your elbow or knee, the epidermis layer is rubbed off and the dermis is exposed. This is why the scrape bleeds and hurts.

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The Human Body
             The Human Body



Health
    Alcohol  
 
    Bicycle Safety  
 
    Circulatory System  
 
    Digestive System  
 
    Disabilities  
 
    Drugs  
 
    Excretory System  
 
    Food Pyramid  
 
    Health Professionals  
 
    Healthy Life  
 
    Hygiene  
 
    Illnesses  
 
 
    Medical Tools  
 
    Miscellaneous Health Topics  
 
    Muscular System  
 
    Nervous System  
 
    Nutrition  
 
    Reproductive System  
 
    Respiratory System  
 
    Skeletal System  
 
    Teeth  
 
    The Five Senses  
 
    The Human Body  
 
    Tobacco  
 


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