Caption: Calcium is released from the muscle's sarcoplasmic reticulum. An influx of calcium from the extra-cellular fluid triggers further release of calcium from the sarcoplasmic reticulum, through calcium release ryanodine receptor channels. About 75% of calcium present in the cytosol during cardiac muscle contraction is from the sarcoplasmic reticulum, with the remaining 25% coming from extracellular sources.

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Keywords: calcium, muscle, muscular system, ryanodine receptor channel, sarcoplasmic reticulum

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Sarcoplasmic reticulum

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