Clarkson
05-17-2006, 12:06 PM
The human body is a complex system. It consists of cells or small units that are organized to function together. Every body function is coordinated by the nerve cells in the brain, whether it is movement of the eyes or the heartbeat. In the body, Muscles are one of the most important constituents. They account for 40 percent of body weight. These are the tissues or materials with specialized cells. Muscles are made up of elastic fibers that can contract and relax. The contractile nature of Muscle makes possible various body movements, an upright posture and specific shape to a human body. For example, lifting a box involves the action of Muscles in the hands.{br}{br}View the Entire Article (http://ezinearticles.com/?Muscles&id=183050){br}