Myofibrils are Composed of Smaller Structures Called _______ That Are

Question

Myofibrils are composed of smaller structures called _______ that are made of protein threads.
A) filaments
B) perimysium
C) sarcomeres
D) fibers

Accepted Answer

Myofibrils are composed of two main filaments: actin (thin) and myosin (thick). These protein threads are arranged in repeating units called sarcomeres, which are responsible for muscle contraction. Perimysium and fibers are not directly related to the structure of myofibrils.