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Circulatory System
 Red Blood Cells (Grades 4 to 6)

Red Blood Cells (Grades 4 to 6)
Reading Level
     edHelper's suggested reading level:   grades 4 to 6
     Flesch-Kincaid grade level:   5.44

Vocabulary
     challenging words:    hemoglobin, nucleus, spleen, spongy, blood, dioxide, actually, millimeter, liver, main, marrow, become, carbon, pass, cell, flow

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Red Blood Cells
By Jennifer Kenny 		  
1     Red blood cells are one of the four main parts of blood. The other parts are white blood cells, platelets, and plasma. Did you know that there are about twenty-five trillion red blood cells in an adult's body?
 
2     Red blood cells are very tiny. One hundred twenty-five red blood cells placed end-to-end would only be one millimeter long.
 
3     Red blood cells are shaped like a doughnut. They are round, but they look like their centers have been partially scooped out. Even though they are considered cells, they do not have a nucleus. They are soft and flexible so they can pass through the capillaries. They can't move on their own, though. Instead, the flow of blood carries them.

Paragraphs 4 to 6:
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