USMLE Road Map: Physiology presents a concise and focused examination of the essential concepts in physiology. Through a streamlined and easy-to-follow hierarchical outline format, it guides students through the basic physiologic principles and reviews the normal and abnormal functions of the major organ systems. The outline is enhanced with an extensive and original illustration program that visually conveys the essential information and promotes retention of the material. Features such as clinical correlations and clinical problems are also included.