The Circulatory System

With a tight focus on the heart, blood, and blood vessels, this level-3 reader helps “early fluent” readers understand these essential elements of the human body. Pettiford concisely identifies the circulatory system, explains how it works, and discusses why it is important. The book is heavy on specialized vocabulary, which is bolded in the text and defined in a glossary. A mix of photos and simple, bright diagrams appear on nearly every page and directly support the text. An activity about counting your pulse before and after exercise ties in nicely with the book’s concepts. Overall, the clarity and focus of this book (part of the Your Body Systems series, 6 titles) make it an appealing and helpful source of basic information about the human circulatory system.