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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.

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"sarcomere." A Dictionary of Biology. . Encyclopedia.com. 22 Oct. 2017 <http://www.encyclopedia.com>.

"sarcomere." A Dictionary of Biology. . Encyclopedia.com. (October 22, 2017). http://www.encyclopedia.com/science/dictionaries-thesauruses-pictures-and-press-releases/sarcomere-0

"sarcomere." A Dictionary of Biology. . Retrieved October 22, 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.

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"sarcomere." A Dictionary of Zoology. . Encyclopedia.com. 22 Oct. 2017 <http://www.encyclopedia.com>.

"sarcomere." A Dictionary of Zoology. . Encyclopedia.com. (October 22, 2017). http://www.encyclopedia.com/science/dictionaries-thesauruses-pictures-and-press-releases/sarcomere

"sarcomere." A Dictionary of Zoology. . Retrieved October 22, 2017 from Encyclopedia.com: http://www.encyclopedia.com/science/dictionaries-thesauruses-pictures-and-press-releases/sarcomere