a complex protein, consisting of myosin and actin, that is the major constituent of skeletal muscle and is thought to interact with ATP to cause muscle contraction.
ac·to·my·o·sin (āk'tə-mī'ə-sĭn) n. The system of actin and myosin that, with other substances, constitutes muscle fiber and is responsible for muscular contraction.
Main Entry: ac·to·my·o·sin Pronunciation: "ak-t&-'mI-&-s&n Function: noun : a viscous contractile complex of actinand myosin concerned together with ATP in muscular contraction
actomyosin ac·to·my·o·sin (āk'tə-mī'ə-sĭn) n. A protein complex that is the essential contractile substance of muscle, composed of the globulin myosin and actin.