Sarcomeres

From The School of Biomedical Sciences Wiki
Jump to: navigation, search
S.gif
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][2]

References

  1. Wilson. H, Hunt. T (2008) Molecular Biology Of The Cell, 5th edition, New York: Garland Science.
  2. Sarcomere picture http://en.wikipedia.org/wiki/Sarcomere August 12, 2014.
Personal tools
Namespaces
Variants
Actions
Navigation
Toolbox