Myofibrils are saparated into groups

Myofibrils are organized into groups called fascicles, which are bundles of muscle fibers. Each myofibril consists of repeating units called sarcomeres, the functional units of muscle contraction. These sarcomeres contain thick and thin filaments that slide past one another during contraction. The grouping of myofibrils and their organization within fascicles allows for efficient force generation and muscle movement.