Klappentext

Explores the human circulatory system. This book begins with a narrative of the circulatory system in action before explaining how it works, what can happen when it does not work properly, and what people can do to keep it strong. Vivid images and a helpful diagram will aid in comprehension. Additional features include a table of contents, sidebars, critical thinking questions, Fast Facts, an activity for further learning, a phonetic glossary, an index, an introduction to the author, and sources for further research.