The official web site of the Department of Cell Biology and Physiology at University of North Carolina, U.S.A. is at:  http://www.med.unc.edu/cellbiophysio  In 2013 the department of Cell & Molecular Physiology (Physiology) combined with the Department of Cell Developemt & Biology (Anatomy).
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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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