noun Biology.
- any of the segments of myofibril in striated muscle fibers.
noun
- any of the units that together comprise skeletal muscle
n.
- One of the segments into which a fibril of striated muscle is divided.
- The contractile unit of a skeletal muscle fiber. Sarcomeres are divided into bands of filaments made of actin or myosin. During muscle contraction, the filaments slide over each other to cause shortening of the sarcomere.