Body Works: Muscles - The Muscular System

Product Description

Whether you are running a race or taking a nap, you are always using your muscles. Muscles are tissues that allow the body to move. The body's hundreds of different muscles make up the muscular system. Some muscles control movements that take place inside the body. For example, muscles direct the movement of blood through the circulatory system. Muscles also control the movement of food through the digestive system. Other muscles control the movement of the body itself, such as the movement of your hand when you turn the pages of this book.