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Muscle contraction

  1. Jun 18, 2005 #1
    Why do muscle fibres need T-tubules for the action potential to go down to stimulate the sarcoplasmic reticulum to release calcium ions? Why couldnt it just travel along the sarcomere?

    Thanks. :-)
  2. jcsd
  3. Jun 19, 2005 #2
    The T-tubules lead the activity to places where it is effective (i.e. close to contact points with the sarcoplasmatic reticulum).
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