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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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