The length of myofibril from one Z-band to the next is described as:
Correct answer: C. Sarcomere
- A. Sarcolemma
- B. Sarcoplasm
- C. Sarcomere
- D. Muscle fibre
Explanation
The region lying between two Z-bands is called a Sarcomere. Sarcomeres are the functional units of muscle contraction and are composed of actin and myosin filaments.
This question appeared on the UHS MDCAT 2013 paper, which you can sit online with every answer explained.
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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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