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actinomyosin |
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actinomyosin, the complex consisting of parallel threads of actin and myosin proteins that constitutes muscle fibers. It is responsible for the contraction and relaxation of muscle. When a muscle fiber contracts, the two proteins slide past each other, shortening the fiber while increasing its apparent thickness. Also called actomyosin. See also sliding filaments. How to thank TFD for its existence? Tell a friend about us, add a link to this page, add the site to iGoogle, or visit webmaster's page for free fun content. |
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