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The background image shows the internal structure of a muscle fibre (which is a single cell):

1. Myofibrils are the protein rods which slide past each other when a muscle contracts.
2. Sarcoplasmic reticulum stores calcium ions and pumps it up in the process which ends contraction.
3. Terminal cisternea are specialized regions of the sarcoplasmic reticulum which release calcium ions in order to cause contraction.
4. Opening of the transverse tubules to the space outside of the muscle cell.
5. Myoplasm is the surface membrane of the muscle cell.

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