This simple sentence comprised Section 1 of the Equal Rights Amendment (ERA), which was first proposed in Congress by the National Women's Party in 1923.
Muscle fibers are in turn composed of myofibrils. The myofibrils are composed of actin and myosin filaments, repeated in units called sarcomeres, which are the basic functional units of the muscle fiber.
Muscle fibres are the individual contractile units within muscle. A single muscle such as the biceps contains many muscle fibres. Another group of cells, the myosatellite cells are found between the basement membrane and the sarcolemma of muscle fibers.