Skip to main content
Select Source:

sarcomere

sarcomere Any of the functional units that make up the myofibrils of voluntary muscle. Each sarcomere is bounded by two membranes (Z lines), which provide the points of attachment of actin filaments; another membrane (the M band or line) is the point of attachment of the myosin filaments. The sarcomere is divided into various bands reflecting the arrangement of the filaments (see illustration). During muscle contraction the actin and myosin filaments slide over each other (see sliding filament theory) and the length of the sarcomere shortens: the Z lines are drawn closer together and the I and H bands become narrower.

Cite this article
Pick a style below, and copy the text for your bibliography.

  • MLA
  • Chicago
  • APA

"sarcomere." A Dictionary of Biology. . Encyclopedia.com. 15 Dec. 2017 <http://www.encyclopedia.com>.

"sarcomere." A Dictionary of Biology. . Encyclopedia.com. (December 15, 2017). http://www.encyclopedia.com/science/dictionaries-thesauruses-pictures-and-press-releases/sarcomere-0

"sarcomere." A Dictionary of Biology. . Retrieved December 15, 2017 from Encyclopedia.com: http://www.encyclopedia.com/science/dictionaries-thesauruses-pictures-and-press-releases/sarcomere-0

sarcomere

sarcomere That region of a myofibril of striated muscle that lies between the Z-lines.

Cite this article
Pick a style below, and copy the text for your bibliography.

  • MLA
  • Chicago
  • APA

"sarcomere." A Dictionary of Zoology. . Encyclopedia.com. 15 Dec. 2017 <http://www.encyclopedia.com>.

"sarcomere." A Dictionary of Zoology. . Encyclopedia.com. (December 15, 2017). http://www.encyclopedia.com/science/dictionaries-thesauruses-pictures-and-press-releases/sarcomere

"sarcomere." A Dictionary of Zoology. . Retrieved December 15, 2017 from Encyclopedia.com: http://www.encyclopedia.com/science/dictionaries-thesauruses-pictures-and-press-releases/sarcomere