The book “Secrets of Physiology” allows you to understand the world of functions of living organisms; it is a science in demand in any medical discipline and is one of the main biological specialties. Physiological knowledge is necessary not only for doctors and biologists, but also for those who devote themselves to veterinary medicine, ichthyology, psychology and pedagogy. This explains the reader's interest in learning the secrets of physiology. Published in Russian in the series of books “Secrets...” a separate volume on problems of physiology will certainly find its own reader. The books in this series are an example of a new successful form of communication between authors and potential readers.