Multiple choice

Muscle fibers are composed of many

  1. Collagen filaments

  2. Microfibrils

  3. Microfilaments

  4. Myofibrils

Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Muscle fibers (which are individual muscle cells) contain numerous cylindrical organelles called myofibrils. These myofibrils run parallel to the length of the cell and contain the sarcomeres responsible for contraction.