From the AuthorsDear You! This script, dedicated in particular to undergraduate medical students, is a compendium of information necessary to understand the basic, and therefore especially important, physiological phenomena responsible for the proper functioning of the human body. The authors have made every effort to find information about the basic dysfunctions of their functioning and pathology after discussing the physiology of individual systems andorganizations. The development, which you have in hand, is intended to help students to deepen the basic areas of knowledge in the field of physiology and pathology and to master theoretical issues that facilitate preparation for practical classes and work with the patient.As Aristotle said "true knowledge is knowledge of the causes", so we encourage you to know the causes and effects of the processes taking place in your own body.