An adult has 206 bones and more than 650 muscles in their body, and each one has an important role to play. This book explores how the skeleton and muscles have multiple jobs within our body, from protection and structure to movement and blood production. Mind-boggling facts (for instance, you will grow around seven skeletons in your lifetime!), and clear and straighforward diagrams help to explain the important functions of your skeleton and muscles, while unique photos enable the reader to see the human body in a whole new light.