Muscles - Seymour Simon - Bog

Don't move a muscle--read all about them! Did you know that... Without muscles you couldn't blink--or even breathe!Nearly 700 muscles control your life.Big or small, a muscle is made up of just one cell.Exercise doesn't give you more muscles, but it strengthens the ones you have.Discover how muscles make us move--and see what it really looks like under your skin.