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).
This question appeared on the UHS MDCAT 2024 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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More Muscle Contraction questions
Thick filaments in skeletal muscles are composed of:
The accumulation of 'lactic acid' in the muscles results in:
During the sliding of actin filaments, ATP is used for?
Contraction can be sustained for a long period of time by:
During muscle relaxation, the calcium ions are:
The sarcomere is the region of a myofibril between two successive: