Muscular system. Computer artwork of a male runner demonstrating the human muscular system. These muscles, making up one of the outer layers of the body, are skeletal muscles, which are under the conscious control of the brain. They account for around 45% of the weight of the body. Muscles are mainly composed of proteins; in particular, the proteins actin and myosin are involved in making muscles contract. The muscles then pull on tendons that are attached to the bones of the skeleton, producing movements such as running. Skin and fat cover the muscles, while the internal organs and bones lie underneath.
Science Photo Library was founded in 1981 by Michael Marten, one of the authors of "Worlds Within Worlds", a book exploring different ways to observe the universe - from electron micrographs, to images of earthrise taken from the Apollo spacecraft. When Marten started receiving requests for the beautiful images in the book, he had an idea of setting up Science Photo Library.
Since then, Science Photo Library has continued to work alongside world acclaimed photographers and the leading science and medical experts to provide a central source of the best science and specialist imagery available. Although the collection started with scientific images, it has grown to encompass all aspects of science and their impact on everyday life.
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