Physiology of the Respiratory System is a book intended for students and professionals of Veterinary Medicine, Animal Husbandry, Biology, Agronomy and other related careers who need and are interested in its contents. Its purpose is to satisfy the study of the physiological processes that develop during the complex process of respiration in domestic animals, with an adequate didactic-methodological approach, taking into account the most interesting aspects published in books, magazines, texts and own experience, responding to the interests of the study program for the training of agricultural professionals. Ramón Garcia Herrera Doctor of Veterinary Medicine Doctor of Veterinary Sciences (PhD) Full Professor-Consultant.