Muscles: Our Muscular System by Seymour Simon

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.