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. 2014 Sep 15;5:350. doi: 10.3389/fphys.2014.00350

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Copyright © 2014 Månsson.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) or licensor are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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The sarcomere, the highly ordered functional unit of striated muscle with key protein components schematically illustrated. The resting length of the sarcomere is approximately 2.0 μm in the human heart and 2.5 μm in human skeletal muscle.