Watch Human skeleton, muscles, movement and posture - Part II for Free: How to Stream the Movie Online at 123Movies. . Part two of two teaching films about human anatomy which is devoted to the action of the skeletal muscles in producing movement of the bones at the joints of the human skeleton. It uses live action and animated medical illustrations as well as an actual skeleton with commentary. A man, naked to the waist, also demonstrates the relevant physical processes such as respiration.