if by on it's own you mean subconsciously, then the heart and the diaphragm
heart muscle
heart This muscle is called cardiac muscle. Each cell can beat on its' own if in a sterile dish. If it touched another, they will beat together.
rotation
Skeletal Muscles.
It's true its the muscle that moves your eyes :)
The muscle is the "diaphragm" muscle. It is located beneath the lungs. When it moves down and away, it creates lower pressure around the lungs, and the air pressure outside the body flows into the lungs. When it moves up and in, it compresses the lungs, increasing the pressure to force the air back out.
The muscle that moves the eyelids is called the orbicularis oculi muscle. It is responsible for closing the eyelids.
The cardiac muscle
muscle fibers contracting
Pulling and contracting is how a muscle moves the bones ....
Buccinator
the diaphragm... ^_^