A protein complex synthesised from actin and myosin in skeletal (or striated) muscles that when stimulated shrinks and causes muscle contraction, with the energy being supplied by adenosine triphosphosphate.
See Actin, Adenosine triphosphate (ATP), Myosin, Myofibrils and myofilaments, Proteins, Sarcomere, Striated (or striped or voluntary) muscle