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Samirah Jones October 18, 2016 The Human Muscular System The human 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. There are three major classes of muscle found in the body and they are skeletal, visceral (smooth) and cardiac muscles. The human body consists of about 640 muscles; with about 320 identical pairs of bilateral muscles. Like bones found in the human body, muscles are also located in the upper and lower limbs, torso, head, and neck. Muscular system is the system of human body that provides motor power for all movements of body parts. Muscular system is composed of special tissue called muscular tissue. Muscles can contract actively to provide the force for movements of body parts. Muscular system is an important system of human body because without it, life will completely stop. Muscles produce not only those movements that are under the control of our will and that we can see and feel, but also those movements that are responsible for activities like breathing, digestion of food, pumping of blood etc. Types of muscles: Muscles are basically of three types; Skeletal Muscles, Smooth Muscles and Cardiac Muscles. Skeletal Muscles: Skeletal muscles form most of the human body weight. They are under the control of human will and all body movements occurring by our will are produced by skeletal muscles. They are called skeletal muscles because they are almost always found attached to the skeleton and produce movements in different parts of the skeleton. Smooth Muscles: Smooth muscles form the soft body organs like stomach, intestine, blood vessels etc. They are not under the will of human beings and are responsible for unconscious body activities like digestion of food. They are called smooth muscles because when seen under the microscope, they do not have any striation in contrast to the other two types of muscles. Cardiac Muscles: Cardiac muscles are exclusively found in human heart and nowhere else. They are extremely strong and powerful muscles. They are not under the control of human will and are involuntary. The pumping of blood by human heart is because of the force provided by the contraction of cardiac muscles.