"What do you use with every move you make? Muscles! You use muscles to do a cartwheel and lift a pencil. But they also help your heart beat, help you breathe, and work to break down food in your tummy. What could be mightier than muscles? Explore what's inside you with fun text, bright pictures, and lively illustrations"--
Ages 7-8 Bearport Publishing Company.|||Grades 2-3 Bearport Publishing Company.|||500L Lexile|||juvenile
by Rachel Rose.
Includes index.
