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Red Blood Cells Circulatory System

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Red Blood Cells
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Reading Level

	edHelper's suggested reading level:	grades 4 to 6
	Flesch-Kincaid grade level:	5.44

Vocabulary

challenging words:

nucleus, trillion, hemoglobin, spleen, spongy, blood, marrow, actually, liver, millimeter, dioxide, main, carbon, plasma, doughnut, become

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Red Blood Cells By Jennifer Kenny

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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 7:
For the complete story with questions: click here for printable

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Circulatory System

Circulatory System

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