The muscular system is an organ system consisting of skeletal, smooth and cardiac muscles. It permits movement of the body, maintains posture, and circulates blood throughout the body. The muscular system in vertebrates is controlled through the nervous system, although some muscles (such as the cardiac muscle) can be completely autonomous. Together with the skeletal system it forms the musculoskeletal system, which is responsible for movement of the human body.
Muscular system in human body moves the body and enables many body organs to perform their functions. Without muscles the body will not be able to carry out most of its normal processes such as circulation of blood, breathing, and digesting the food. Also the body will not be able to move. In this way a person cannot continue to live without the contribution of muscular system in functioning of his or her body.