Respuesta :
The H zone is the region that only contains the thick filaments, the I band only contains the thin filaments, the A band contains the entire thick filaments, which also includes a small portion of the thin filaments.
When the muscle contracts, the H zone (central Azone region) consisting of thick filaments shortens and the I band containing only thin filaments also shortens during the contraction time. Two cytoskeletal anchor proteins, termed obscurin and myomesin, present in the H band, are responsible for anchoring myosin to the sarcoplasm. The H zone consists only of myosin, the I band only actin, and the A band contains both actin and myosin. The M line holds together the thick myosin filaments. The Z line differentiates between each sarcomere. Zone H contains only thick filaments. The A band contains thick and thin filaments and is the center of the sarcomere that spans the H zone. When the muscle contracts, the H zone, the I band, and the distance between the Z lines become smaller, while the band A stays the same.
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