Myofibrils are long, thread-like structures found within muscle fibers, made up of repeating units called sarcomeres that facilitate muscle contraction. These cylindrical organelles contain the proteins actin and myosin, which interact during contraction to generate force and movement. Understanding myofibrils is crucial for grasping how muscles function and contribute to locomotion in various organisms.
congrats on reading the definition of myofibrils. now let's actually learn it.