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Meaning of sarcoplasmic reticulum

sar•co•plas'mic retic'ulum

Pronunciation: (sär"ku-plaz'mik), [key]
— Cell Biol. Cell Biol.
  1. a system of membrane-bound tubules that surrounds muscle fibrils, releasing calcium ions during contraction and absorbing them during relaxation.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.