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− | [[Eiweißkörper/en|protein]] of the thin filament of the [[Muskel/en|muscle]]fiber. If [[Calcium/en|calcium]] | + | This is the [[Eiweißkörper/en|protein]] of the thin filament of the [[Muskel/en|muscle]] fiber. |
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+ | If [[Calcium/en|calcium]] [[Ionen/en|ions]] are ejected to a high degree from the [[Longitudinale_Tubuli/en|t-tubules]] (in case of stimulus via nerve), they bind to the [[Tropomyosin/en|tropomyosin]]. Thus the binding to the [[Aktin,_Aktinfäden/en|actin thread]] is released and the myosin heads of the [[Myosinfilamente/en|myosin filaments]] can hook into the actin. | ||
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+ | When the energy carrier [[Adenosintriphosphat,_ATP/en|ATP]] from the mitochondri is consumed to [[Adenosindiphosphat/en|ADP]] , the myosin heads bend off and pull the actin filaments in. This is the basic mechanism of muscle contraction. | ||
https://de.wikipedia.org/wiki/Tropomyosin <sub>([https://de.wikipedia.org/wiki/Wikipedia:Lizenzbestimmungen_Commons_Attribution-ShareAlike_3.0_Unported Wikipedia CC-by-sa-3.0])</sub> | https://de.wikipedia.org/wiki/Tropomyosin <sub>([https://de.wikipedia.org/wiki/Wikipedia:Lizenzbestimmungen_Commons_Attribution-ShareAlike_3.0_Unported Wikipedia CC-by-sa-3.0])</sub> |
This is the protein of the thin filament of the muscle fiber.
If calcium ions are ejected to a high degree from the t-tubules (in case of stimulus via nerve), they bind to the tropomyosin. Thus the binding to the actin thread is released and the myosin heads of the myosin filaments can hook into the actin.
When the energy carrier ATP from the mitochondri is consumed to ADP , the myosin heads bend off and pull the actin filaments in. This is the basic mechanism of muscle contraction.
https://de.wikipedia.org/wiki/Tropomyosin (Wikipedia CC-by-sa-3.0)