Which of the following occurs during muscular contraction?
Correct answer: D. All of these
- A. Actin slides past myosin
- B. ATP supplies energy
- C. Calcium ions are involved
- D. All of these
Explanation
When muscles need to contract, calcium ions bind with the troponin molecule and cause them to move slightly. ATP is hydrolysed. This ATP is needed to break the link between the myosin and the actin.
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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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When more energy is required in muscle contraction then that energy can also be produced by _ as a secondary source.
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