Why is your blood red? How much does your hair grow? And where do babies come from? A little girl named Koko asks questions that guide three intrepid explorers through the human body as they explore the functions that make it work. Organized into 20 sections, this engaging book for readers 4 to 7 addresses a multitude of topics, from "Eating and Staying Healthy" to "My Skin." Whimsical collage illustrations appear throughout, and the book also includes games, recipes, and craft activities.