Learn all about the human skeletal and muscular systems with new, precise, yet easy-to-understand, definitions and explanations. What are the main functions and components of the skeletal system? What are the types of bones in the skeletal system?  What are muscles?  What are the different types of muscles in our bodies, and what are their jobs?  The answers to all of these questions are covered in depth with detailed graphics, diagrams and exciting video.  On-screen, multiple-choice reviews at the end of each segment reinforce important concepts and make learning fun.