We are humbled by the popularity of our textbook titled Essentials of Medical Physiology achieved. Now we are publishing ninth edition of textbook and Fourth edition of this book together. We would like to thank the students, faculty and health professionals around the world for their support, feedback and appreciation without which we would not have made it where we are now. The book has come a long way since its first edition. It would not have been possible to bring the book to this level without efforts and hard work of my wife Dr Prema Sembulingam and also co-author of this book. Her encouragement, emotional and professional support have been a driving force for me. Though we miss her now, the efforts and work rendered by her for this edition also could not be forgotten. That made me to mention "We" in this preface also. Modern trend of learning and teaching along with examination pattern is diverted from long question-answer system towards short question-answer system all over the world. This type of change in education system enables faculty and examiners to cover a wide area of subject. It is also easier for students read and remember the answers in short form. Our study on these issues and suggestions from our colleagues and fellow teachers made us to publish this book Review of Medical Physiology. This edition is based on the latest (ninth) edition of the textbook Essentials of Medical Physiology. The special aspect of this edition is to help all the students studying physiology to revise the whole subject in short duration. This book will also enable them to prepare well for all type of examinations including Entrance Examinations for higher education. Unique features of this edition is coverage of Essay and Short notes questions, Multiple choice questions, Viva voce questions and Clinical scenarios. Students are advised to read the textbook thoroughly to understand physiology in depth. After understanding the subject, this book will be useful for quick revision. Both the books have come a long way since the first edition. This would not have become possible without the efforts and hard work of my wife Dr Prema Sembulingam who was also the co-author of both the books. Her encouragement, emotional and professional support has been a driving force for us. Though we miss her, her thoughts will always be with us. As always, we welcome and appreciate your opinions, feedback, comments and suggestions. This has and will help us improve the quality and content of both the books.