Which band contains the thick filaments in their entirety?

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Multiple Choice

Which band contains the thick filaments in their entirety?

Explanation:
This question tests how thick and thin filaments are arranged along a muscle’s sarcomere. The thick filaments, made of myosin, run the full length of the A-band, so that band contains the entire length of the thick filaments. The I-band has only thin filaments, and the Z-line marks the sarcomere boundary where actin attaches. The central H-zone falls within the A-band and contains only thick filaments, but it does not span the whole length of the thick filaments. Therefore, the band that contains the thick filaments in their entirety is the A-band.

This question tests how thick and thin filaments are arranged along a muscle’s sarcomere. The thick filaments, made of myosin, run the full length of the A-band, so that band contains the entire length of the thick filaments. The I-band has only thin filaments, and the Z-line marks the sarcomere boundary where actin attaches. The central H-zone falls within the A-band and contains only thick filaments, but it does not span the whole length of the thick filaments. Therefore, the band that contains the thick filaments in their entirety is the A-band.

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