A sarcomere is the region of a myofibril between two successive:
Correct answer: C. Z-lines
- A. M-lines
- B. I-bands
- C. Z-lines
- D. T-tubules
Explanation
Z-lines, also called Z-discs, are protein structures that act as anchoring points for the thin filaments within the sarcomere. They define the boundaries of the sarcomere, marking the ends of each repeating unit. Z-lines are connected to neighboring Z-lines via the structural protein alpha-actinin, forming a network of interconnected sarcomeres within a myofibril.
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About Support and Movement
Support and movement covers the axial and appendicular skeleton, bone structure, joints and the arrangement of skeletal muscles. Muscle contraction is explained through actin, myosin, sliding filaments, calcium ions and ATP, while arthritis is distinguished as a disorder of joints rather than a normal part of movement.
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