Human physiology seeks to understand the mechanisms that work to keep the human body alive and functioning, through scientific enquiry into the nature of mechanical, physical and biochemical functions of humans, their organs, and the cells of which they are composed. The principal level of focus of physiology is at the level of organs and systems within systems. Physiology helps us understand what happens in a healthy body in everyday life and what goes wrong when someone gets sick. The study of physiology is, in a sense, study of life. It asks questions about the internal workings of organism and how they interact with the world around them. The most relevant arm of physiological research to medical news today is applied human physiology; this field investigates biological systems at the level of the cell, organ and organ system. Hence explore and utilize the facts and principles in the field of physiology to application level in undergraduate, postgraduates and research level for the maximum benefit of human being.