Dealing with comparative physiology with major focus on human physiology, this book stresses fundamental concepts to give a firm grounding in physiology. Beginning with foundations of physiology, the book discusses physiologically important biomolecules, action of enzymes and role of vitamins and minerals. It then presents in a comprehensive manner the organ system physiology comprising digestive, respiratory, circulatory, excretory, nervous, muscular, endocrine and reproductive systems. The book also includes a chapter on homeostasis and environmental adaptations. Key Features: Illustrates topics with suitable diagrams for a clear-cut grasp of the topics. Provides model question papers to help students reflect upon their understanding of the subject matter. The book is designed for undergraduate students of Zoology and Life Sciences. It would also be useful to postgraduate students of Zoology and Life Sciences as well as to those preparing for competitive examinations