Sarcoplamic reticulum

J. M. Vanderkooi, S. Papp, T. Samoriski, S. Pikula, and A. Martonosi, Tryptophan phosphorescence of the Ca2 + -ATPase of sarcoplamic reticulum, Biochim. Biophys. Acta 957, 230-236(1988). 

In skeletal muscle open voltage-gated L-type Ca2+ channels can interact directly with muscle ER (sarcoplasmic reticulum) ryanodine receptors to open the ryanodine receptor Ca2+ channel and thence elevate cytosolic Ca2+ concentration from sarcoplamic. reticulum Ca2+ stores. However in neurons and cardiac muscle activation of PM voltage-gated Ca2+ channels indirectly activates ryanodine receptor Ca2+ channels as outlined in the section on Ligand-gated Ca2+ channels . 

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See also in sourсe #XX -- [ , , , ]

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