Sarcomeres: Difference between revisions
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A sarcomere is a repeating unit within the [[Myofibril|myofibril]] of skeletal muscle cells. The sarcomere is split into the H-zone, A-band, I-band, M line and Z line. The H-zone consists of [[Myosin|myosin]] only, the I-band consists of [[Actin|actin]] only and the A-band contains both [[Actin|actin]] and [[Myosin|myosin]]. The M-line holds together the thick myosin filaments. The Z-line differentiates between each sarcomere. During the [[Muscle contraction|contraction]] of skeletal muscle cells the A-band stays the same length whereas the H-zone and I-band decrease in length. The distance between the Z-lines also decreases. <ref>Wilson. H, Hunt. T (2008) Molecular Biology Of The Cell, 5th edition, New York: Garland Science.</ref> | |||
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Revision as of 03:18, 27 November 2013
A sarcomere is a repeating unit within the myofibril of skeletal muscle cells. The sarcomere is split into the H-zone, A-band, I-band, M line and Z line. The H-zone consists of myosin only, the I-band consists of actin only 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. During the contraction of skeletal muscle cells the A-band stays the same length whereas the H-zone and I-band decrease in length. The distance between the Z-lines also decreases. [1]
References
- ↑ Wilson. H, Hunt. T (2008) Molecular Biology Of The Cell, 5th edition, New York: Garland Science.