The book "Practical Physiology: A Textbook for High Schools" is written by Albert F. Blaisdell. In this edition, the author describes in detail the main aspects of the physiology of the human body, starting from the cellular level and ending with the study of the work of individual organs and systems. The book will be a very useful source of knowledge for students who are interested in the functioning of the human body and medical aspects of physiology. The publication contains clear explanations, illustrations and practical tasks that will help to better understand the work of various systems of the human body.