Sarcomere is part of myofibril between:
Correct answer: D. Two Z lines
- A. Two I bands
- B. Two A bands
- C. Two M lines
- D. Two Z lines
Explanation
A sarcomere is the basic structural and functional unit of a muscle fiber, specifically within striated muscle such as skeletal and cardiac muscle. It is defined as the segment of the myofibril that lies between two adjacent Z-discs (or Z-lines).
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About Muscle Contraction
Muscle contraction is explained by the sliding filament model, in which myosin heads pull actin filaments within sarcomeres using ATP. The topic covers calcium, troponin, tropomyosin, the neuromuscular junction and relaxation, with attention to how filament length stays almost constant while the sarcomere shortens.
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