What is myofilament?

Myofilament is a chain of protein molecules found in myofibrils of a striped muscle. There are two types of myofilament, thin and strong, while thin fibers are primarily made of protein actin and thick primary composed of myosin protein. In striped muscle tissue, the fibers are arranged in myofibrils in recurring polypeptide complexes called sarcomers. Myofilaments play an important role in muscle contraction and relaxation. The heart muscle is also striped and is found only in the walls of the heart. In the cells of striped muscles are tubular organelles called myofibrils. Myofibrils are formed by bounds of proteins in the form of dense and thin myofilaments. When the muscle is shortened when it is downloaded or stretched when re -relaxed. The thin myofilament is primarily made of a protein called actin, which is assembled into a scaffold of a similar ladder during muscle contraction, which can then use myosin fibers to generate force. In a thin myofilament there are molecules of actin proteins inAvailable to two other types of protein called nebulin and troponin. Strong myofilament is primarily made of myosin motor protein that is connected to an actin network of proteins with another protein called tititin.

myofilaments play a role in muscle contraction using a model called Sliding Fiber model. The action potential of the pulse from the central nervous system causes the release of calcium ions from the skeletal muscle tissue. Calcium ions bind with protein tropomyosin, which obscures myosin binding sites on actin myofilaments. CACIMUS CHONTRUCTURE OF TROPOMYOSIN molecules, allowing myosin fibers to create chemical bonds with actin fibers at myosin binding areas.

Once myosin and actin fibers are tied together, the contraction process actually begins. The muscles are shortened or contracting because myosin myofilaments slip over the passive network of actin proteins. OnceThe muscle performs a contract, nucleotide called adenosine triphosphate (ATP) binds to myosin fibers and weakens their binding with actin fiber. Myosin fibers use ATP to get energy to separate from the actin fibers and return to their original position. This causes the muscle to extend and return to the relaxed position.