what are sarcomeres
Thick and thin filaments are organized into contractile units called sarcomeres. A sarcomere extends from one Z line to the next and represents the fundamental unit of muscle contraction.From Copstead, 1995.sarÂ·coÂ·mere/ (sahrÂ´ko-mÄr) the contractile unit of a myofibril; sarcomeres are repeating units, delimited by the Z bands, along the length of the myofibril.