sarcomere


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sarcomere

 [sahr´ko-mēr]
the contractile unit of a myofibril; sarcomeres are repeating units, delimited by the Z bands along the length of the myofibril.
Thick and thin filaments are organized into contractile units called sarcomeres. A sarcomere extends from one Z line to the next and represents the fundamental unit of muscle contraction. From Copstead, 1995.

sar·co·mere

(sar'kō-mēr),
The segment of a myofibril between two adjacent Z lines, representing the functional unit of striated muscle.
[sarco- + G. meros, part]

sarcomere

/sar·co·mere/ (sahr´ko-mēr) the contractile unit of a myofibril; sarcomeres are repeating units, delimited by the Z bands, along the length of the myofibril.

sarcomere

(sär′kə-mîr′)
n.
One of the repeating contractile segments into which a myofibril is divided, composed of actin and myosin filaments and giving striated muscle its distinctive bands.

sarcomere

[sär′kōmir]
Etymology: Gk, sarx + meros, part
the smallest functional, contractive unit of a myofibril. Sarcomeres occur as repeating units, extending from one Z line to the next along the length of the myofibril.
enlarge picture
Sarcomere

sar·co·mere

(sahr'kō-mēr)
The segment of a myofibril between two adjacent Z lines, representing the functional unit of striated muscle.
[sarco- + G. meros, part]

sarcomere

The structural unit of a striped muscle fibre (myofibril).
Sarcomereclick for a larger image
Fig. 273 Sarcomere . Muscle fibrils consist of alternating groups of the thick and thin filaments (dark and light bands), the distance between two Z-membranes being termed a ‘sarcomere’.

sarcomere

that part of the muscle fibre which is contained between two Z-MEMBRANES, and is the contractile element of the fibre.

See MUSCLE, I-BAND.

sarcomere

length-wise repeating unit of striated muscle, from one Z line to the next; length about 2.5 × 10-6 in fully extended muscle, less in shortened. See also myofibrils.

sarcomere

the contractile unit of a myofibril; sarcomeres are repeating units, delimited by the Z bands along the length of the myofibril.
References in periodicals archive ?
The patients' cardiomyocytes had a larger size and irregular sarcomere organization and most cells had nuclear localization of NFATC4 which belongs to transcriptional factors involved in hypertrophy development [62].
Also, deducing from the arrowhead appearance and the triangular shape of actin, the polarity of actin-containing filaments in sarcomere was determined: The convex surface of actin as seen in Fig.
Initially, we have slided actin filaments on either side of A band in a single sarcomere toward its center.
It is believed that this stiffness might arise from hypercontracture of the sarcomere in this area [41, 42].
This model proposed a mechanism of SPOC behavior seen as periodical changes in sarcomere length with a saw-tooth waveform under a constant Ca concentration.
Muscle strains are the most common sports injury and usually occur during an eccentric contraction when the actin-myosin filaments stretch and lengthen beyond their normal overlap within the sarcomere (11).
Furthermore, researchers have utilized short fibers to evaluate the effects of multiple compounds and treatments on excitation-contraction coupling (ECC), measure sarcomere size, analyze the distribution and function of mitochondria and study transgenically modified forms of ECC proteins (4,5,7-11).
Effect of postrigor sarcomere length on mechanical and structural characteristics of raw and heat-denatured single pork muscle fibres.
Williams PE (1990) Use of intermittent stretch in the prevention of serial sarcomere loss in immobilised muscle.
5 months of age, were used to evaluate the effect of feed restriction on the muscle fiber diameter, sarcomere length, tissues architecture, glycogen content and ultra-structure changes in the muscle of Longissimus dorsi and liver.
According to the literature, factors affecting the texture of meat can be related to the living animal (age, sex, nutrition, exercise, stress before slaughtering, presence of connective tissue, thickness and sarcomere length) and to the conditions during and after slaughtering (electrical stimulation, rigor mortis, carcass cooling rate, maturation, methods and temperature of cooking and final pH).
Cardiac dysfunction is thought to be occurred because HP leads to depleted ATPase levels and then depressed myocardial sarcomere contractility, or to acute myocardial damage itself.