This invaluable book provides the first description of the diverse and fascinating functions of heme in life processes for a broad audience. It begins with an introduction of the intricate chemical properties of heme and the history of early observations of human diseases associated with heme. It then proceeds to describe the versatile roles of heme in controlling diverse molecular and cellular processes germane to human life and disease processes. In the second edition, a new chapter is devoted to describe findings about heme uptake, transport, and trafficking of heme synthesis intermediates in mammals. Additionally, a chapter about the newly discovered roles of elevated heme biosynthesis and uptake in lung tumorigenesis is included.Heme Biology is unified and logical in presentation. It is well suited for students and professionals in life sciences who wish to know about the fascinating biology of heme and its usefulness in health and diseases. It may also be used as a reference book for advanced readers and researchers who are interested in heme biology. The explanations in the book are detailed enough to capture the interest of the curious reader, and complete enough to provide the necessary information for researchers to have an in-depth molecular understanding of heme biology and further their studies in this fascinating realm.