Book excerpt: This special edition of PhysioEx TM has been specifically written for use with Germann/Stanfield, Principles of Human Physiology. PhysioEX TM consists of nine physiology lab simulations that may be used to supplement or substitute for wet labs. This easy-to-use software allows readers to repeat labs as often as they like, perform experiments without harming live animals, and conduct experiments that may be difficult to perform in a wet lab environment due to time, cost, or safety concerns. Readers also have the flexibility to change the parameters of an experiment and observe how outcomes are affected. Available in both CD-ROM and web (www.physioex.com) formats, PhysioEx TM is fully supported by a written lab manual that walks readers through each lab step-by-step. It is an ideal complement to any physiology course!