When actin is pulled past the myosin filament the..
A. Sarcomere shortens
B. Muscle shortens
C. Z line shortens
D. All of the above
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Which of the following statements is true about the sliding filament theory?
A. During contraction the H zone remains the same length
B. A cross-bridge is formed by troponin and tropomysin attaching to one another
C. A nerve impulse causes an action potential to spread across the muscle
D. ATP is released around the filaments, stimulating the muscle to contract
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