Human physiology is the scientific study of the normal function of the human body and its various systems. This field of study examines how different organs and tissues work together to maintain homeostasis, or the body's internal balance. Researchers in human physiology investigate processes such as respiration, circulation, digestion, metabolism, and the nervous system, among others. By understanding how the human body functions at a cellular and molecular level, researchers can develop treatments for diseases, improve athletic performance, and enhance overall health and well-being.