From platelets to plasma, the parts of the blood can be exciting to learn about when you have helpful, friendly kids to guide you! Readers enjoy flowing through the circulatory system with their new friends in this book, which explains how blood moves, what it's made of, and the teeny tiny living things that can be found in it. Full of simple diagrams to aid comprehension, this book is perfect for readers just learning about the human body—and how cool it is!