Reading Metrics
Grade Level
Lower Grades (LG K-3)
Book Level
5.4
Points
0.5
Fiction/Nonfiction
Nonfiction
Word Count
1238
Points per Word
0.000404
Page Count
24
Points per Page
0.020833
Description
This introduction to the human respiratory system explains how the lungs work, what role they play in keeping people alive and healthy, and what happens when something goes wrong.