This course is designed to provide a basic knowledge about the function of each organ system of domestic animal. After completing this course, student can understand the dynamic equilibrium and the relationship between each organ system. In addition, on those knowledge base ,student can learn pharmacology & clinical diagnosis more easily. The topics of the course include nerve and muscle, circulation, respiration, digestion, metabolism, kidney faction , growth, reproduction and endocrinology. The entire course not only includes fundamental information but also has provides latest research work reflecting on this fast-growing physiology area.