Anatomical structures of the musculoskeletal system

Regarding the effort and load, describe the main difference between a lever operating with a mechanical advantage versus a lever operating at a mechanical disadvantage. 2. What anatomical structures of the musculoskeletal system correspond to the components of a lever system? Describe the arrangement of these parts in first, second, and third class lever systems. 3. Name and describe the locations and actions of the muscles typically used in breathing.