ROGER HARRIS / SCIENCE PHOTO LIBRARY ROGER HARRIS / SCIENCE PHOTO LIBRARY
Muscular system. Computer artwork showing the musculature of the side of a human male running. The muscles shown are skeletal muscles. These muscles are consciously controlled by the brain. They move the body by contracting and relaxing, often in opposing pairs, which pulls tendons (white) attached to the skeleton. They account for just under half the body's weight.
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