One of the functions of the muscular system is pumping blood. <span>The cardiac muscles in our body control the pumping of blood throughout arteries and veins. The contraction of the heart muscle is involuntary and is controlled by the hearts own electrical system. The right side of the heart receives blood from the body and pumps it to the lungs. The left side of the heart receives blood from the lungs and pumps it out to the body.</span>
