“A Textbook of Human Physiology” offers a thorough examination of the systems that support human existence and is intended to provide students a solid foundation in the field of physiology. The demands of experts in the biological sciences, healthcare, and healthcare professions as well as students in undergraduate and graduate programmes are all carefully considered in the planning of this book. The underlying ideas of human physiology are introduced at the beginning of the book. It goes over the multiple biochemical processes necessary to sustain life, homeostasis, and the cell hypothesis. The textbook is structured around the main systems of the human body, including the Nervous System, Cardiovascular System, Respiratory System, Digestive System, Renal System, Endocrine System, Musculoskeletal System, and Reproductive System. The textbook places a strong emphasis on critical thinking and active learning. Every chapter is structured to expand on prior information in order to promote a comprehensive grasp of human physiology. Students are encouraged to go beyond memory and strive for a better understanding of the material via the inclusion of practical activities and application-based questions. The main objective of “A Textbook of Human Physiology” is to provide professionals and students with a thorough grasp of physiological processes in humans. The goal of the book is to spark a lifetime interest in the field of the human body as well as its workings by presenting difficult material in an approachable and captivating way.