Reading Metrics
Grade Level
Middle Grades (MG 4-8)
Book Level
4.4
Points
0.5
Fiction/Nonfiction
Nonfiction
Word Count
1734
Points per Word
0.000288
Page Count
24
Points per Page
0.020833
Description
This introduction to the human circulatory system explains what it is and how it works and looks at the connections between the heart, lungs, and blood.