A system of chambers of the [[endoplasmic reticulum|endoplasmic reticulum]] of (striated) muscle cells (sarcoplasmic reticulum), which can cause muscle contraction by [[myosin filaments]] and [[actin filaments]] by expulsion of [[calcium]].
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A system of chambers of the [[Endoplasmatisches_Retikulum/en|endoplasmic reticulum]] of (striated) muscle cells (sarcoplasmic reticulum), which can cause muscle contraction by [[Myosinfilamente/en|myosin filaments]] and [[Aktinfilamente/en|actin filaments]] by expulsion of [[Calcium/en|calcium]].
