A new exhibition at McWane Science Center is attracting a good deal of attention. Entitled “Body Worlds,” the traveling exhibit uses preserved human bodies and body parts to explain the workings of organs, muscles, the nervous system and skeletal structures. The bodies are preserved through a technique called plastination, a technique that removes body fluids and replaces them with plastics that harden. The preservation of the donated bodies is, of course, one of the interesting facets of the exhibition, but it is also educational. The specimens on display show comparisons and contrasts between healthy bodies and organs and those stricken with disease. The whole body plastinates, as they are called, show muscles and ligaments in motion in a pole jumper, a swimmer and more. Translucent body slices show the complexity of the most sophisticated mechanism in the world, the human body. “Body Worlds” runs through May 1.