View source for Sarcolemma

&nbsp;Sarcolemma is the cell membrane of muscle cells. It has an extension called t-tubules which facilitate muscle contraction by &nbsp;transmiting of depolariszation, causing thre release of calcium ion into the sarcoplasm. Calcium ion trigger the muscle contraction.<ref>J. E. Ritchie(2008), Muscles, bones and skin (Third Edition), Page:18, Mosby International Ltd</ref>