MUSCLE PHYSIOLOGY

Detailed explanation-1: -A sarcomere is the functional unit (contractile unit) of a muscle fiber. As illustrated in Figure 2-5, each sarcomere contains two types of myofilaments : thick filaments, composed primarily of the contractile protein myosin, and thin filaments, composed primarily of the contractile protein actin.

Detailed explanation-2: -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-3: -The sarcomere of striated muscles. Depicted in Figure 1 is the sarcomere, which is the basic contractile unit of striated muscle.

Detailed explanation-4: -Sarcomeres are considered as the most basic contractile units in muscles. They are made up of the contractile myofilaments (myosin and actin) and a series of structural proteins (e.g., titin, nebulin and desmin).