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Sarcotubular System, sarcolema - Coggle Diagram

- - - - their lumen contains ECF which surrounds the muscle cell.
        
        facilitate the rapid transmission of the impulse in the form
        of AP from sarcolemma to the myofibrils.
        
        The membrane of T-tubules contains voltage-gated Ca2+ channels
        called dihydropyridine receptors
        (as they get blocked by the drug dihydropyridine),
        through which they activate the longitudinal sarcoplasmic reticulum.
  - - - L-tubules do not open to the exterior like T-tubules.
        
        longitudinal sarcoplasmic tubules on either side of the T-tubule are
        dilated to form the so-called terminal cisterns.
        
        A T-tubule with the two terminal cisterns lying in close proximity (contiguity)
        constitutes a triad which is found at the junction of A and I bands.
        
        Thus, there are two triads in each sarcomere.
        
        they store a large quantity of calcium ions.
        
        When the AP reaches the cisterns of L-tubules, these Ca2+
        ions released are into the sarcoplasm through the calcium channels
        present on their membrane.
        
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