This new Pocket Companion provides a concise overview of the most important facts and concepts from Guyton & Hall's Textbook of Medical Physiology, 9th Edition. Like the text, this resource integrates new material on molecular and cellular physiology with coverage of basic physiology and its relation to clinical medicine. The pocket companion's clearly written, well-organized discussions make it easy for readers to quickly grasp the physiologic principles applicable to the practice of medicine.