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Sarcoplasmic reticulum

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In striated muscle, sarcoplasmic reticulum is a type of smooth endoplasmic reticulum specially adapted to surround the myofibrils, forming dyads in cardiac muscle and triads in skeletal muscle with invaginations of the plasma membrane called T-tubules.

The sarcoplasmic reticulum contains large stores of calcium, which it sequesters and then releases when the cell become depolarised.[1] This has the effect of triggering muscle contraction.


  1. Toyoshima C, Nakasako M, Nomura H, Ogawa H. (2000, June 8). Crystal structure of the calcium pump of sarcoplasmic reticulum at 2.6 A resolution. Nature. 405(6787):647-55.

External links

de:Sarkoplasmatisches Retikulum
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