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The background image shows the internal structure of a muscle fibre (which is a single cell):
- Myofibrils are the protein rods which slide past each other when a muscle contracts.
- Sarcoplasmic reticulum stores calcium ions and pumps it up in the process which ends contraction.
- Terminal cisternea are specialized regions of the sarcoplasmic reticulum which release calcium ions in order to cause contraction.
- Opening of the transverse tubules to the space outside of the muscle cell.
- Myoplasm is the surface membrane of the muscle cell.
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