★ Musculoskeletal System Responses to Exercises Quiz
What is the role of the M-line in muscle contraction?
A. Initiate muscle relaxation
B. Anchors myosin filaments in the center of the sarcomere
C. Generate ATP for cross-bridge formation
D. Stabilize the actin filaments
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Which type of muscle fibers are fatigue-resistant and are found in postural muscles?
A. Fast-twitch oxidative-glycolytic (type IIa)
B. Fast-twitch glycolytic (type IIb)
C. Slow-twitch oxidative (type I)
D. All of the above
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