Inside this guidebook to the muscular system, readers will learn about the different kinds of muscles and how they function. From your eyes to your toes, muscles help you get things done every day. They help you grab, lift, push, pull, swing, and twist. The muscular system is made up of three different kinds of muscles. Many muscles move by thinking about the movement. Others work constantly without us thinking about them, and these muscles help keep us alive. Easy-to-follow, scientific text is paired with colorful photographs and diagrams to help readers learn about the muscular system.