Beneath our skin, numerous systems are enacting complex processes, each as important as the other. Through detailed diagrams and animations, discover the hidden wonders of the skeletal, muscular, cardiovascular, repertory and nervous system. We explain how these essential system work in conjunction with each other to create these amazing machines we call the human body. Throughout this program we examine each of these systems, their parts, their functions and how they work. We also explore the contribution and interaction of these vital systems when we exercise and while we rest.