2. During a muscle contraction, which of the following does not change length? a) The distance between Z lines b) The width of I bands c) The width of A bands d) None of the above
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b) The width of I bands decreases, as the actin filaments slide over the myosin filaments, reducing the region where only actin is present. c) The width of A bands does not change, as the length of the myosin filaments remains constant during contraction. d) Show more…
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