if by on it's own you mean subconsciously, then the heart and the diaphragm
An involuntary muscle. The two types of them, that i know, are smooth and cardiac i believe.
Involuntary
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.
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.
muscle fibers contracting
The cardiac muscle
Pulling and contracting is how a muscle moves the bones ....
Buccinator
the diaphragm... ^_^
There are three different muscles * skeletal muscle(moves bones) * smooth muscle(moves organs and blood vessels) * cardiac muscle(heart)
Serratus Anterior, moves scapula forward.