The monograph presents lectures on normal physiology of excretory, digestive, endocrine, nervous systems in accordance with the program. In addition, lectures on the physiology of GND and drug addiction are also presented. The lectures are based on 30 years of experience of the authors in lecturing at the Department of Normal Physiology of the Tajik State Medical University named after Abu Ali ibn Sino.The lectures are prepared according to the program for students of medical and biological faculties and medical universities.