Divided into sections, the book starts with fast facts on topics including the skeleton, muscles, brain, sense, heart, and digestion; and the book ends with charts of body organ facts and record breakers. Using this information, you can complete the puzzles in the main part of the book, plus there are hands-on activities such as watching your muscles work, testing your reflexes, and seeing how two eyes work together.

Finally, test your new-found knowledge with the quick quizzes (with answers supplied, but no peeking!). You can keep track of your achievements throughout with a star-chart to fill in every time you finish a page. Note to parents: The Eyewitness Project Book series is devised and written with the expert advice of educational and reading consultants and is designed to appeal to children aged 8 years and up.