Sarcoplasmic Reticulum

Sarcoplasmic Reticulum is physically separate from the sarcolemma and surrounds each myofibril. Sarcoplasmic reticulum membrane contains high levels of calcium ATPase. The sarcoplasmic reticulum functions to uptake calcium from the sarcoplasm and to release calcium into the sarcoplasm to initiate contraction and sequester it during relaxation.

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