Ultrastructure of cardiac muscle in reptiles and birds: optimizing and/or reducing the probability of transmission between calcium release units

@article{Perni2012UltrastructureOC,
  title={Ultrastructure of cardiac muscle in reptiles and birds: optimizing and/or reducing the probability of transmission between calcium release units},
  author={Stefano Perni and Venkat Ramesh Iyer and Clara Franzini-armstrong},
  journal={Journal of Muscle Research and Cell Motility},
  year={2012},
  volume={33},
  pages={145-152}
}
It is known that cardiac myocytes contain three categories of calcium release units (CRUs) all bearing arrays of RyR2: peripheral couplings, constituted of an association of the junctional SR (jSR) with the plasmalemma; dyads, associations between jSR and T tubules; internal extended junctional jSR (EjSR)/corbular jSR that is not associated with plasmalemma/T tubules. The bird hearts, even if fast beating (e.g., in finch and hummingbird) have no T tubules, despite fiber sizes comparable to… CONTINUE READING

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