ALFRED PASIEKA / SCIENCE PHOTO LIBRARY ALFRED PASIEKA / SCIENCE PHOTO LIBRARY
Muscles. Computer artwork of a front view of a man's skeletal muscle system with part of a protein molecule superimposed. Skeletal muscles are under the conscious control of the brain and account for around 45% of the weight of the body. Muscles are mainly composed of proteins, notably the contractile elements actin and myosin. The artwork of the musculature was drawn by the Flemish anatomist Vesalius in the 16th century.
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