Presents information on how to get energy from food and what happens along in the digestive system.

Ba-boom, ba-boom, ba-boom . . . your incredible heart beats more than once every second, no matter what you're doing. And your lungs pull in up to 145 gallons o

Muscles help you run, jump, play sports, and even sit still long enough to read this book. Your bony skeleton holds you up and keeps everything in its place. Le

When we eat food, we don't need to think about how our bodies will break it down. The digestive system takes care of that for us. Readers will learn the ins and