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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