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Your Blood's Other Job

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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

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¹     Caption: This is a scanning electron microscope image from normal circulating human blood. One can see red blood cells, several white blood cells, and many small disc-shaped platelets. Picture by Bruce Wetzel (photographer) and Harry Schaefer (photographer) 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 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 chemicals 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

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The Human Body

The Human Body

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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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