T tubules

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 The action potential generated travels deep into the cell by the aid of t-tubules, which are invaginations of the sarcolemma. They help spread the impulse so that the cell is able to contract at the same time.[1]


References 
  1. A.Fullick, J.Locke, P.Bircher. A level biology for OCR. Oxford University Press, Great Clarendon Street, Oxford, OX2 6DP, United Kingdom. 2015.
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