Human physiology is the study of how the human body functions. It has evolved over time to encompass molecular, cellular, endocrine, cardiovascular, respiratory, and other areas of focus. Applied human physiology includes fields like space physiology, sports physiology, exercise physiology, and clinical physiology. Going forward, human physiology aims to better understand the interrelationships between human consciousness, the external environment, and insights from disciplines like psychology, ancient medicines, and spiritual traditions.