If we as small as a cell, you can enter the human body, so when we came to the muscles, they will find muscle is turned by a muscle fiber bundle of cables. These cables are combined into thicker, longer cable groups, and when they force them, they are like a spring like a spring. Within the thickest cables, there are muscle fibers, nerves, blood vessels, and connective tissue. Each muscle fiber is made up of smaller muscle fibers. Each muscle fiber is composed of two types of filaments (myosin and actin) that are entangled together. This is the most basic unit of muscle, large chunks of muscle, the strong man is all by these two kinds of small proteins that were unthinkable variegated, when they unite, can make a great action to. It is these muscles that change the face of the earth.