When a skeletal muscle contracts, what is happening at the level of the muscle proteins?
A) Thick filaments shorten.
B) Thin filaments slide relative to thick filaments.
C) Thin filaments depolymerize to shorten.
D) Calcium ions bind to tropomyosin, which allows actin to bind to myosin.
E) Tropomyosin binds to troponin, which allows calcium to bind to actin.
Correct Answer:
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