sarcoplasmic reticulum


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reticulum

 [rĕ-tik´u-lum] (L.)
1. a small network, especially a protoplasmic network in cells.
agranular reticulum smooth-surfaced endoplasmic reticulum.
endoplasmic reticulum an ultramicroscopic organelle of nearly all higher plant and animal cells, consisting of a system of membrane-bound cavities in the cytoplasm, occurring in two types: granular or rough-surfaced, bearing large numbers of ribosomes on its outer surface, and agranular or smooth-surfaced.
granular reticulum rough-surfaced endoplasmic reticulum.
sarcoplasmic reticulum a form of agranular reticulum in the sarcoplasm of striated muscle, comprising a system of smooth-surfaced tubules surrounding each myofibril.

sar·co·plas·mic re·tic·u·lum

the agranular endoplasmic reticulum of skeletal and cardiac muscle; the complex of vesicles, tubules, and cisternae forming a continuous structure around striated myofibrils, with a repetition of structure within each sarcomere.

sarcoplasmic reticulum

n.
The form of endoplasmic reticulum found in striated muscle fibers.

sar·co·plas·mic re·tic·u·lum

(sahr'kō-plaz'mik rĕ-tik'yū-lŭm)
The endoplasmic reticulum of skeletal and cardiac muscle; the complex of vesicles, tubules, and cisterns forming a continuous structure around striated myofibrils, with a repetition of structure within each sarcomere.

sarcoplasmic reticulum

The endoplasmic reticulum of a muscle cell which stores and releases calcium ions.

sarcoplasmic reticulum

the cysternae of a single muscle fibre, equivalent to the ENDOPLASMIC RETICULUM of other cells.
References in periodicals archive ?
Optical mapping of sarcoplasmic reticulum ca2+ in the intact heart: ryanodine receptor refractoriness during alternans and fibrillation.
Several NOX isoforms are expressed in striated muscle and located within the sarcoplasmic reticulum, the sarcolemma, and the transverse tubules [34, 35].
Fabiato, "Appraisal of the physiological relevance of two hypotheses for the mechanism of calcium release from the mammalian cardiac sarcoplasmic reticulum: calcium-induced release versus charge-coupled release," Molecular and Cellular Biochemistry, vol.
We isolated sarcoplasmic reticulum (SR) from deep and superficial muscle, and quantified SERCA expression using SDS-PAGE and Western blotting.
Marhl, "Role of sarcoplasmic reticulum and mitochondria in [Ca.sup.2+] removal in airway myocytes," Biophysical Journal, vol.
Interestingly, there is a very close correlation between the rate of sarcoplasmic reticulum [Ca.sup.2+] uptake and the PLB to SERCA2a ratio in hypothyroid, euthyroid, and hyperthyroid hearts, and this determines the contractile effectiveness of the heart [35].
(9) This potentiates the release of calcium ions from the sarcoplasmic reticulum into the sarcoplasm.
"This could be explained by the inotropic effect of taurine that, as previously demonstrated, stimulates the release of calcium from the sarcoplasmic reticulum," he added.
Amino acid sequence of a Ca2++Mg2+- dependent ATPase from rabbit muscle sarcoplasmic reticulum, deduced from its complementary DNA sequence.
In vitro, caffeine potentiates twitch force by increasing [Ca.sup.2+] release from the sarcoplasmic reticulum [16]; however this occurs at dosages deadly to humans [17].
(13) During an episode of MH, exposure to the triggering agent causes intracellular calcium release by the sarcoplasmic reticulum and sustained skeletal muscle contractions and rigidity.