Sarcolemma

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 Sarcolemma is the cell membrane of muscle cells. It has an extension called t-tubules which facilitate muscle contraction by  transmiting of depolariszation, causing thre release of calcium ion into the sarcoplasm. Calcium ion trigger the muscle contraction.[1]

  1. J. E. Ritchie(2008), Muscles, bones and skin (Third Edition), Page:18, Mosby International Ltd