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The I-band is the region on either side of a Z-disc that contains only thin filaments and titin. As the actin is pulled toward the M line, the sarcomere shortens and the muscle contracts. I is a thin letter: I band has only thin filaments. Within the H-zone is a thin M-line (from the German "Mittelscheibe", the disc in the middle of the sarcomere) formed of cross-connecting elements of the cytoskeleton. Skeletal muscle is the muscle type that initiates all of our voluntary movement. Herein lies the sarcomere’s main purpose. The center of the H zone is at the M line, which is also at the center of the sarcomere. A is a hybrid of “I” and “H”: A band has both thin and thick filaments (remains constant during contraction) Suggested Reading and Resources: Pelvis X-ray : Simplified Approach . The relationship between the proteins and the regions of the sarcomere are as follows: Actin filaments, the thin filaments, are the major component of the I-band and extend into the A-band. Thick filaments are anchored in the middle of the sarcomere at the M-line. This means it is the most basic unit that makes up our skeletal muscle. H is a thick letter: H zone has only thick filaments. The myosin head moves toward the M line, pulling the actin along with it. M for middle: M line represents the midline of sarcomere. This movement is called the power stroke, as it is the step at which force is produced. This partial overlap in filaments makes the A-band darker at its ends, leaving a light area in the middle (H-band) where there is no overlap with the light bands. The H zone becomes smaller as the muscle contracts and the sarcomere shortens. As the actin is pulled, the filaments move approximately 10 nm toward the M line. Hi there Let's start from beginning- H-Zone-: Source-: Albert.io H-Zone is a zone of thick filaments that has no actin. Sarcomere definition. Therefore, in the H zone, the filaments consist only of the thick filament. A sarcomere is the functional unit of striated muscle.

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