noun Biochemistry.
- 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.
noun
- a complex protein in skeletal muscle that is formed by actin and myosin and which, when stimulated, shortens to cause muscle contraction
n.
- A protein complex that is the essential contractile substance of muscle, composed of the globulin myosin and actin.