"Join Koko and the explorers on a journey inside your body from the top of your head to the tips of your toes. Along the way, find out about your busy brain, beating heart, bony skeleton, and much more."--Back cover.
A little girl named Koko asks questions about the human body and how it works and three explorers go inside to find out, in a book that offers games and other activities to help young readers to discover the answers for themselves.