Answer: myosin.
- A myosin
- B keratin
- C collagen
- D elastin
Correct answer: A. myosin
Explanation: The thin actin filaments slide over the thick myosin filaments, shortening the sarcomere.
A sarcomere (Z line to Z line): during contraction the I band and H zone shorten as thin filaments slide over thick, while the A band stays the same length. Image: SlothMcCarty, CC BY-SA 3.0, via Wikimedia Commons.
Concept context
Types of movement, muscle contraction, skeletal system, joints, and disorders. Important for Class 11 and NEET.