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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.

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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.

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• MeSH Sarcoplasmic+reticulum
• Histology at Boston University 21602loa - "Ultrastructure of the Cell: sarcoplasm of skeletal muscle, sarcoplasmic reticulum and mitochondria"
• Diagram at bgsu.edu
• Physiology at MCG 2/2ch3/communic