ANATOMY

Detailed explanation-1: -A sarcomere is the basic contractile unit of a myocyte (muscle fibre). A sarcomere is composed of two main protein filaments (thin actin and thick myosin filaments) which are the active structures responsible for muscular contraction.

Detailed explanation-2: -The sarcomere is the smallest contractile unit in the myofibril. Sarcomeres contract because the Z-lines move closer together. As the sarcomeres contract the myofibrils contract. As the myofibrils contract the muscle cell contracts.

Detailed explanation-3: -The contractile functional unit of the myofibril is called the sarcomere, which is approximately 1.6–2.0 m in length. The different regions of the sarcomere are classified according to their ability to polarize light.

Detailed explanation-4: -Sarcomeres are the smallest functional contractile unit of muscle, and myofibrils are striated muscle organelles that are comprised of sarcomeres that are strictly aligned in series.

Detailed explanation-5: -The smallest contractile unit in striated muscles is the sarcomere.