If the cross-bridges bind to actin, they will pivot in such a way as to cause the actin filaments to slide. This pivoting action causes the actin filaments to slide _.
Correct answer: A. Closer together
- A. Closer together
- B. Farther apart
- C. Towards the Z-line
- D. Both Options B and C are correct
Explanation
When the cross‐bridges bind to actin, they will pivot in such a manner to cause the actin filaments to slide closer together.
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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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