How Does Your Heart Beat? Is one of four books in the Inquisitive kids guide to the human body series. How Does Your Heart Beat? Is a fantastic introduction to the incredible ways that our body keeps us alive. The respiratory, circulatory, and immune systems are explained through hilarious, colorful illustrations and an engaging question and answer format, designed to appeal to even the most reluctant readers. Packed with plenty of giggle-worthy gross bits, it's a fun and accessible young guide to an important subject. Stuff kids want to know, that need an answer. How much blood is in your body? What are germs, and are they all baddies? What are boogers made of? Yuk! Find the answers to these questions and much more! Kids will love the hilarious illustrations It's a fresh take on a popular topic. With so many fun facts to uncover, science has never been more fun!.