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Sagot :
Final answer:
Muscle contraction shortens actin filaments, the H zone, and the I band.
Explanation:
During muscle contraction, actin filaments, the H zone, and the I band decrease in length. The actin filaments slide over the myosin filaments, causing the I band and H zone to shorten. The A band remains the same length as the myosin and actin overlap.
Learn more about muscle contraction here:
https://brainly.com/question/33378824
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