JustPhysiology is an online learning resource composed of interactive lab experiments powered by HumMod, the most complete model of integrative human physiology in the world. JustPhysiology invites the student to explore human physiology as never before by pairing an intuitive user interface with a faster-than-real-time mathematical model. This software is designed for use by undergraduate students in biomedical engineering, biology, nursing, physical therapy and, of course, physiology.