肌质网(sarcoplasmic reticulum)
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心肌和骨骼肌细胞中的一种特殊的内质网,其功能是参与肌肉收缩活动。肌质网膜上的Ca2 -ATP酶将细胞基质中的Ca2 泵入肌质网中储存起来, 使肌质网Ca2 的浓度比胞质溶胶高出几千倍。受到神经冲动刺激后, Ca2 释放出来,参与肌肉收缩的调节。
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