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The three sections along the length of a sarcomere are the A band, the I band, and the H zone. The A band is the dark region in the center of the sarcomere that contains both thick and thin filaments, while the I band is the light region at the ends of the sarcomere that contains thin filaments only. The H zone is the region in the center of the sarcomere where only thick filaments are present.
Dark
the A-bandsthe A-bands
I believe that would be in the sarcomeres of muscle cells.
Titin is part of the A-band of a Sarcomere.
some band regions I and A disks ....
A sarcomere consists of thin and thick filaments arranged so they can slide over each other. The boundary of the sarcomere are the Z lines. Thin filaments extend from the Z lines and overlap with thick filaments in the middle of the sarcomere. The I band is on each side of the Z line where only thin filaments occur. The A band is the length of the thick filaments and is divided into three parts; the zone of overlap is on each end where thin and thick filaments occur, the H band is in the middle and has only thick filaments, and the M line is the center of the A band.
aka I-Band. The Isotropic band is the section of a striated muscle sarcomere that contains only thin myofilaments. This band, along with the H zone decrease in length during muscle contraction.
It is the terminal cisternae
The sarcomere itself will become shorter.The sarcomere will shorten.
Sarcomere
It is a lighter region that contains thick filaments, but no thin filaments.