Overview of the musculosketletal system, including how bones and muscles interact and how breakthroughs in technology are making bionic body parts a reality. Examines the structure and functions of the skeletal system. Describe the types of muscles in the human body and how they contract.




Overview of the respiratory and circulatory systems, with an explanation of how these systems bring oxygen to the body's cells and carry wastes away. Explores the major parts of each system and describes how scientists are working to find replacements for what fails or wears out.