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The two main protein filaments involved in muscle contraction are myosin and:

  • A actin
  • B keratin
  • C collagen
  • D albumin

Correct answer: A. actin

Explanation: Thick myosin and thin actin filaments slide past each other during contraction.

Concept context

Types of movement, muscle contraction, skeletal system, joints, and disorders. Important for Class 11 and NEET.

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