★ Muscles and Movements Quiz
Thin filaments in a myofibril are
A. Sarcomeres
B. Sarcoplasm
C. Actin
D. Myosin
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What is a crossbridge?
A. Where myosin binds to actin
B. Where the calcium crosses into the cytoplasm
C. Where calcium binds with troponin
D. None of the answers are correct.
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