/0/6728/coverbig.jpg?v=8479bfaba1b9fd0dfac8fd39b667793e)
One necessary means of establishing proper relations between the body and its surroundings is motion.77 Not only can the body move itself from place to place, but it is able to move surrounding objects as well. In the production of motion three important systems are employed-the muscular system, the nervous system, and a system of mechanical device