The new edition of this companion to Guyton & Hall's Textbook of Medical Physiology, 12th Editiondelivers the salient points from the parent text in a manner that is ideal for rapid comprehension of the core concepts in the discipline. Small enough to fit in your pocket, you'll find concise, easy-to-reference physiology essentials wherever you are...whenever you need it most. My medical physiology course is extremely intense and there is no time to read all of the assigned reading in the textbook. Thanks to this pocket version of the text I am able to review chapters in half the time. I also recommend the textbook which provides detail description of figures that may not be covered in the pocket companion. Pretty good text and a must for serious advanced physiology students who are headed toward medical or advanced nursing/PA degrees. It helps to simplify and consolidate the immense amount of minute and detailed info stocked up in the big text.I wish many other books with complex topics had a pocket companion comparable to this one. If the topic is important to your success, then having the pocket companion is indispensible. I see the pocket companion as the architect's view (high level design) of physiology and the first step to learning. Depending on interest and time, you can selectively drill down into the textbook to explain topics of greater importance to you. If a particular topic is not that important you can just read the companion. I have already swept through many chapters and when I hit a chapter I wanted to understand in more detail, such as sports physiology, I went off and read the entire textbook chapter. When other chapters have more detail then I need I stick with the companion. Count yourself lucky to have this pocket companion as a first "cut" to the knowledge in the textbook, it will help immensely during the absorption and after for the quick and convenient recall.