This e-book is the first series of e-MCQ book, and we plan for more series in future. It contains 30 MCQs with answers and explanation on Respiratory Physiology. This is one of the core topics for Part 1 clinical postgraduate examination such as MMed (Anaesthesiology), FRCA and ANZCA. This e-book will also be beneficial to other undergraduates and postgraduates medical-based basic sciences examination.