A dynamic human model is jointed and movable and provides an aid for understanding, studying, and mastering the structure of the human body. In one embodiment, the dynamic human model includes a skeleton model having a plurality of bone elements coupled together by articulating joints, and muscles attachable to the bone elements. The muscles are flexible for contracting and stretching. At least one of the muscles has one or more optical elements incorporated therein for generating a first color when the muscle is contracted and a second color when the muscle is stretched.