Need for having a simple book with basic principles of Medical Physiology has been felt since long. A sincere attempt has been made with the idea of fulfilling the requirements of present day curriculum for medical dental and other allied health courses. This book has given importance to the basic principles of physiology followed by the correlation of basic concepts of physiology with applied aspects of clinical physiology. This book has been largely directed to the broad and specific needs of the readers, and simplicity and clarity has been emphasized. Particularly, students can easily assimilate the logical sequence in which the subjects have been presented not only for them to understand the same but also perform well in the various types of objective and routine examinations. Several readily understandable diagrams and tables have been included to make subject comprehension. Applied physiology, clinical importance and altered situations in pediatrics, geriatrics and pregnancy have been well brought out.