myofibers

Myofibers are the individual muscle cells that make up muscle tissue. They are long, cylindrical structures containing bundles of protein fibers called actin and myosin, which slide past each other to produce muscle contractions. Each myofiber is multinucleated, meaning it has multiple nuclei, and is specialized to generate force and movement. These cells are organized into bundles within muscles, working together to enable actions like lifting, walking, and other movements. Myofibers are essential for muscle function, growth, and repair, responding to physical activity and stimuli to adapt over time.