The Remarkable Respiratory System: How Do My Lungs Work (Slim Goodbody's Body Buddies, 3)

Huff & Puff, our Body Buddy lung twins explain how the lungs and respiratory system function. Readers are introduced to the bronchial tree. They discover how the diaphragm and intercostals muscles help the lungs fill and empty. There are sections on the dangers of smoking, good health practices, respiratory illnesses, and amazing facts.