When a sarcomere contracts and thin filaments move over thick filaments you would expect to see ________.

Question

Quizplus · Accepted Answer

During muscle contraction, the thin filaments slide over the thick filaments, causing the sarcomere to shorten. As a result, the distance between the Z discs (which mark the boundary of each sarcomere) decreases, and the I bands appear smaller. The A band remains the same width, and the H zone may appear narrower or disappear altogether as the thin filaments move over the thick filaments. Therefore, the best choice is D.

When a Sarcomere Contracts and Thin Filaments Move Over Thick