Physiology is the main course of medical specialty, it is an important basic course of medicine, and it is also the functional subject of medical students' first contact after completing the morphological course of human anatomy, histology and so on. 
       Physiology is the science of studying the law of life activity. It declares the internal mechanisms in the normal processes of human systems, organs and cells, especially the functional performance of organs and cells, and how the functional activities of each part of the human body as a whole coordinate and restrict each other, as well as the effects of changes in the internal and external environment on these activities. 
       It enable students to properly understand how system, tissue, organ and cell work and coordinate with each other, and lay the groundwork for following medical courses.