During skeletal muscle contraction, what happens to the actin filaments?
Correct answer: A. They slide toward the M line
- A. They slide toward the M line
- B. They slide away from the M line
- C. They break into smaller protein units
- D. They move out of the muscle fibre
Explanation
During contraction, thin actin filaments slide toward the M line between the thick myosin filaments. The actin and myosin filaments themselves do not become shorter. The sarcomere shortens because the distance between its Z discs decreases.
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About Skeletal and Muscular Systems
The skeletal and muscular systems include bone structure, joints, cartilage, the axial and appendicular skeleton, and the roles of ligaments and tendons. They also cover skeletal muscle organization, the sliding filament mechanism, neuromuscular contraction, and common differences between voluntary skeletal muscle, cardiac muscle and smooth muscle.
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