During the sliding of actin filaments, ATP is used for?
Correct answer: B. Cross bridge breaking
- A. Cross bridge formation
- B. Cross bridge breaking
- C. Dragging filaments
- D. Shortening of filaments
Explanation
ATP is needed for breaking the bridge between the myosin and the actin.
This question appeared on the UHS MDCAT 2023 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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