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Circulatory System
The Human Body
Your Blood's Other Job



Your Blood's Other Job
Reading Level
     edHelper's suggested reading level:   grades 4 to 6
     Flesch-Kincaid grade level:   5.21

Vocabulary
     challenging words:    disc-shaped, teens, immunity, smallpox, image, electron, vaccination, photographer, invaders, invisible, polio, shots, works, attack, defend, normal
     content words:    Bruce Wetzel, Harry Schaefer, National Cancer Institute


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Your Blood's Other Job
By Cindy Grigg
  

1     Caption: This is a scanning electron microscope image of normal circulating human blood. One can see red blood cells, several white blood cells, and many small disc-shaped platelets. Picture by Bruce Wetzel and Harry Schaefer for the National Cancer Institute.
 
2     You already know that your blood takes nutrients and oxygen to all your body's cells. That is the job of the red blood cells. But did you know that your blood has another job? Blood also fights off disease-causing germs.
 
3     The blood's white blood cells attack germs that get inside your body. White blood cells are like your body's army. They fight invaders that do not belong inside you. White blood cells surround the germs and swallow them.
 
4     Your blood also has antibodies. White blood cells attack germs. Antibodies are proteins that join in the fight. There are exact antibodies that fight exact germs. Antibodies stay in your blood, sometimes forever. The white cells and the antibodies are part of your body's immune system.
 
5     Let's say that your body is invaded by the germs that cause chicken pox. The white cells attack the chicken pox germs. Your body makes antibodies that will fight the chicken pox germs, too.

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Circulatory System
             Circulatory System


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  
 
    My Plate  
 
    Nervous System  
 
    Nutrition  
 
    Reproductive System  
 
    Respiratory System  
 
    Skeletal System  
 
    Teeth  
 
    The Five Senses  
 
    The Human Body  
 
    Tobacco  
 


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