The book "Physiology and Hygiene for Secondary Schools" by the author Francis M. Walters is a textbook that covers the main aspects of physiology and hygiene for teenagers. This book clearly and easily explains the principles of functioning of the organs of the human body, the processes of digestion, blood circulation and breathing. The author also draws attention to the importance of maintaining health through compliance with hygienic norms and rules. "Physiology and hygiene for secondary schools" will become an integral part of the educational process for students who are interested in the functions of their body and maintaining their own health.