IMS: Cardiopulmonary System is based on the understanding that the study of physiology is conceptual in nature. As a result, this book carefully and methodically develops the most important concepts underlying the functions of the heart, lungs, and circulation (i.e., the cardiopulmonary system) and demonstrates the integrated nature of the entire system. By taking this approach, medical students will find this text helpful not only in understanding the most important elements of cardiopulmonary physiology but also in providing a useful review of the heart, lungs, and circulation in preparation for Step 1 of the USMLE.