Myofibril (Sarcostyle)

Myofibril (Sarcostyle) is a special contractile organelle of striated muscle fiber.

Myofibrils consist of actin and myosin filaments. Actin filaments are two strands of actin twisted into a spiral. Myosin filaments are made of myosin.

The interaction of actin and myosin filaments during ATP hydrolysis ensures the contraction of myofibrils. Thus, myofibrils are the “motor” of muscle contraction at the molecular level.

The myofibrillar system is the contractile system of muscle fibers that provides muscle contraction. It consists of several components, including myofibrils, sarcomeres and intermediate filaments.

Myofibrils are special contractile organelles that are found in striated muscles. They consist of two types of filaments - myosin and actin. Myosin filaments form long filaments that cover actin filaments. Actin filaments are thin filaments that form the skeleton of myofibrils.

Contraction of the myofibrillar system occurs due to the interaction between myosin and actin filaments. When myosin binds to actin, it forms bridges that allow the actin to move along its length. This movement leads to contraction of the myofibril and, therefore, the muscle as a whole.

Sarcomeres are structural units of myofibrils, which consist of several myofibrils linked together by an intermediate filament. Sarcomeres provide coordination of contraction between myofibrils and allow the muscle to contract sequentially.

Intermediate filaments are thin filaments that connect the sarcomeres together. They provide communication between sarcomeres and allow muscles to contract simultaneously.

In general, the myofibrillar system plays an important role in muscle contraction and ensures its functionality. It consists of various components that interact with each other to produce muscle contraction.