Which region of the sarcomere does not change in length during contraction?

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Study for the IMAT Biology Exam with focused multiple-choice questions. Use hints and explanations to enhance your preparation. Get ready for your exam success!

Multiple Choice

Which region of the sarcomere does not change in length during contraction?

Explanation:
During contraction, filaments slide past each other while the thick filaments themselves don’t shorten. The A band marks the full length of the thick filament, so it stays the same length as the sarcomere shortens. In contrast, the I band and the H zone shrink because actin filaments slide inward to overlap more with myosin. Z discs move closer together as the sarcomere shortens. Therefore, the region that remains unchanged in length is the A band.

During contraction, filaments slide past each other while the thick filaments themselves don’t shorten. The A band marks the full length of the thick filament, so it stays the same length as the sarcomere shortens. In contrast, the I band and the H zone shrink because actin filaments slide inward to overlap more with myosin. Z discs move closer together as the sarcomere shortens. Therefore, the region that remains unchanged in length is the A band.

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