Within a sarcomere, which region contains only thin filaments?

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Study for the Anatomy and Physiology Muscular System Test. Prepare with flashcards and multiple choice questions; each question provides hints and explanations. Get ready to excel in your exam!

Multiple Choice

Within a sarcomere, which region contains only thin filaments?

Explanation:
The part of the sarcomere that contains only thin filaments is the I band. This region lies adjacent to the Z discs and consists solely of actin filaments with no overlapping thick myosin filaments. The A band spans the length of the thick filaments and includes regions where thin and thick filaments overlap, so it is not exclusively thin. The H zone, inside the A band, contains only thick filaments and lacks thin filaments. During contraction, the I band shortens as actin slides toward the center, while the A band maintains its length. This makes the I band the myofilament region that contains only thin filaments.

The part of the sarcomere that contains only thin filaments is the I band. This region lies adjacent to the Z discs and consists solely of actin filaments with no overlapping thick myosin filaments. The A band spans the length of the thick filaments and includes regions where thin and thick filaments overlap, so it is not exclusively thin. The H zone, inside the A band, contains only thick filaments and lacks thin filaments. During contraction, the I band shortens as actin slides toward the center, while the A band maintains its length. This makes the I band the myofilament region that contains only thin filaments.

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