How do all the systems in your body work? Flip the flap and find out! This Usborne flap book features over 50 flaps to life to help you learn about eating and excreting, breathing air, pumping blood, brain power, the senses, and more! Flip open organs to see what's going on inside of them, flip open bones to see organs, flip open muscles to see bones, and much more. 14 cardstock pages. Hardcover. Ages 7-11.