MUSCLE PHYSIOLOGY

Detailed explanation-1: -A sarcomere is the basic contractile unit of muscle fiber. Each sarcomere is composed of two main protein filaments-actin and myosin-which are the active structures responsible for muscular contraction. The most popular model that describes muscular contraction is called the sliding filament theory .

Detailed explanation-2: -To say that the sarcomere is the functional unit means that all the components needed for contraction are contained within each sarcomere. In fact, muscle is composed of millions of tiny sarcomeres, and each sarcomere shortens, thus resulting in muscular contraction.

Detailed explanation-3: -Sarcomeres are able to initiate large, sweeping movement by contracting in unison. Their unique structure allows these tiny units to coordinate our muscles’ contractions. The image depicts skeletal muscle fiber. In fact, the contractile properties of muscle are a defining characteristic of animals.

Detailed explanation-4: -The sarcomere is the fundamental contractile unit of the myofibril.