Explores the diverse systems of the human body and their functions, the major organs, and how the different parts of the body work together. Reveal the inner workings of the human body with this illustrated atlas. An exciting visual guide that maps the entire human body-- inside and out. Find out what happens to food after you swallow it, how each beat of your heart pumps blood around your body, where your funny bone is, and which muscles you use to smile. Learn how tiny hairs inside your ear enable you to hear, why you laugh when your toes are tickled, how messages speed from body to brain, and what makes you hiccup and why you yawn. Study each part of your body in detail, examining the workings of every muscle, bone, and organ.