In simple words, muscles.
In more abstract and thought porvoking concepts, the main parts are what an anthropophage would most appreciate, unless they are restricted to non solid diets, in which case they would be more concerned with the cullinary benefits of the skeletal system.
muscular system
the bones of course (well if you don't like this answer than ask someone who is smart than!)
the heart
muscular
producing motion , providing stabilization , providing heat :)
skeletal,cardiac,smooth
The brain.
The muscular system
Skeletal System - Skeleton and nerves
CONNECTIVE and MUSCULAR
The common parts of the muscular system are the fibers, which are striated, the cardiac muscle, smooth muscle and skeletal muscle. There are also flexor muscles and extensors muscles, which aid in movement.
The major organ in the muscular system responsible for generating movement and providing support to the body is the skeletal muscles.