★ Musculoskeletal System Responses to Exercises Quiz
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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What is the role of calcium ions in muscle contraction?
A. Initiate muscle relaxation
B. Activate troponin to expose binding sites on actin
C. Generate ATP for cross-bridge formation
D. Stabilize the sarcomere structure
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