Where is your heart? How do your lungs work? What does your heart pump around your body? Find the answers to these questions and much, much more in this comprehensive introduction to how our lungs and heart work to keep us alive. Packed with photographs and diagrams, fascinating facts and activities to complete, this is the perfect hands-on introduction to how the human body works. Written and checked by experts, it uses clear and simple explanations making complex ideas easy to understand, and features a glossary to explain tricky terms, as well as parents and teachers' notes to help take the learning further.