Multiple choice

Thick muscle filaments contain which protein?

  1. Pepsin

  2. Actin

  3. Myosin

  4. Collagen
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Thick filaments in muscle fibers are composed of the motor protein myosin, which has heads that bind to actin to facilitate contraction. Actin is found in thin filaments, while pepsin is a digestive enzyme and collagen is a structural protein in connective tissue.

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