During skeletal muscle contraction, which change occurs within a sarcomere?
Correct answer: C. The Z lines move closer together
- A. The actin filaments become shorter
- B. The myosin filaments become shorter
- C. The Z lines move closer together
- D. The number of sarcomeres increases
Explanation
As myosin pulls actin toward the centre, the Z lines move closer and the sarcomere shortens. The actin and myosin filaments themselves do not shorten during contraction.
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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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