What is sarcomere?
Correct answer: D. Part between two Z lines
- A. Part between two H zones
- B. Part between two A bands
- C. Part between two I bands
- D. Part between two Z lines
Explanation
The sarcomere is the fundamental unit of a striated muscle fiber, delineated by two Z lines. It contains alternating dark and light bands, specifically the A band, I band, and H zone, which collectively enable muscle contraction. The correct definition is the region between two Z lines. Other options incorrectly describe regions within or aspects of the sarcomere, but they do not accurately define its boundaries.
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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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