Sarcoplasmic Reticulum

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The Sarcoplasmic reticulum (SR) is the equivalent of the [[Endoplasmic_Reticulum|endoplasmic reticulum]] ([[ER]]), only specialized to [[Smooth muscle|smooth]] and [[Striated muscle|striated]] ([[Cardiac musle|cardiac]] and [[Skeletal muscle|skeletal]]) [[Muscle|muscle]] cells, It controls the release of [[Calcium|calcium]] [[Ions|ions]] into the [[Cell|cell]], thus being a main part in the control of [[Muscle contraction|muscle contraction]]. In smooth muscle cells, the SR is much less developed.  
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The Sarcoplasmic reticulum (SR) is the equivalent of the [[Endoplasmic Reticulum|endoplasmic reticulum]] ([[ER]]), only specialized to [[Smooth muscle|smooth]] and [[Striated muscle|striated]] ([[Cardiac musle|cardiac]] and [[Skeletal muscle|skeletal]]) [[Muscle|muscle]] cells, It controls the release of [[Calcium|calcium]] [[Ions|ions]] into the [[Cell|cell]], thus being a main part in the control of [[Muscle contraction|muscle contraction]]. In smooth muscle cells, the SR is much less developed.  
  
The Sarcoplasmic Reticulumis a specialized type of [[Endoplasmic Reticulum|endoplasmic reticulum]] that is found in the [[Cytoplasm|cytoplasm]] of striated&nbsp;[[Muscle|muscle]] cells<ref name="microbiology of the cell">Albert et al., molecular biology of the cell, fifth edition, Garland sciences, Newyork,</ref>. The tubular structures&nbsp;surround the&nbsp;<u>[[Myofibrils|myofibrils]]</u> of the muscle cell&nbsp;and their&nbsp;function is to&nbsp;store [[Calcium|Ca]]<sup>[[Calcium|2+]] </sup>[[Ions|ions]], until they are released when triggered by electical impulses travelling down [[T-tubules|T-tubules]]<ref>Alberts et al., Molecular biology of the cell, Fifth edition, Garland science, Taylor and francis group, New York</ref>. This triggers contraction of the muscle via the <u>[[Sliding filament theory|sliding filament theory]]</u>'''<ref>Alberts et al.,2008, Molecular biology of the cell, Fifth edition, Page 1026, New York, garland science.</ref>,&nbsp;'''which occurs until the Ca<sup>2</sup><sup>+ </sup>is actively pumped back into the sarcoplasmic reticulum.<sub></sub>
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The Sarcoplasmic Reticulumis a specialized type of [[Endoplasmic Reticulum|endoplasmic reticulum]] that is found in the [[Cytoplasm|cytoplasm]] of striated [[Muscle|muscle]] cells<ref name="microbiology of the cell">Albert et al., molecular biology of the cell, fifth edition, Garland sciences, Newyork,</ref>. The tubular structures surround the [[Myofibrils|myofibrils]] of the muscle cell and their function is to store [[Calcium|Ca]]<sup>[[Calcium|2+]] </sup>[[Ions|ions]], until they are released when triggered by electical impulses travelling down [[T-tubules|T-tubules]]<ref>Alberts et al., Molecular biology of the cell, Fifth edition, Garland science, Taylor and francis group, New York</ref>. This triggers contraction of the muscle via the [[Sliding filament theory|sliding filament theory]]<ref>Alberts et al.,2008, Molecular biology of the cell, Fifth edition, Page 1026, New York, garland science.</ref>, which occurs until the Ca<sup>2</sup><sup>+ </sup>is actively pumped back into the sarcoplasmic reticulum.  
  
 
=== References  ===
 
=== References  ===
  
 
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Latest revision as of 10:01, 8 December 2018

The Sarcoplasmic reticulum (SR) is the equivalent of the endoplasmic reticulum (ER), only specialized to smooth and striated (cardiac and skeletal) muscle cells, It controls the release of calcium ions into the cell, thus being a main part in the control of muscle contraction. In smooth muscle cells, the SR is much less developed.

The Sarcoplasmic Reticulumis a specialized type of endoplasmic reticulum that is found in the cytoplasm of striated muscle cells[1]. The tubular structures surround the myofibrils of the muscle cell and their function is to store Ca2+ ions, until they are released when triggered by electical impulses travelling down T-tubules[2]. This triggers contraction of the muscle via the sliding filament theory[3], which occurs until the Ca2+ is actively pumped back into the sarcoplasmic reticulum.

References

  1. Albert et al., molecular biology of the cell, fifth edition, Garland sciences, Newyork,
  2. Alberts et al., Molecular biology of the cell, Fifth edition, Garland science, Taylor and francis group, New York
  3. Alberts et al.,2008, Molecular biology of the cell, Fifth edition, Page 1026, New York, garland science.
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