Therese M. Shea 
Using Your Lungs [PDF ebook] 

Our lungs are amazing organs, the stars of the respiratory system! Readers will be fascinated to learn what actually happens in their lungs to make it possible for them to breathe in and out, without even having to think about it. Accessible, at-level text is coupled with beneficial photographs and diagrams to aid in reader comprehension. Curriculum-oriented fact boxes offer further information to cultivate an early interest in human biology, while a concluding activity reviews key concepts about the lungs.