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- The release of calcium ions
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Card 4 / 27: The release of calcium ions initiates muscle contractions. Watch this video ( http://openstaxcollege.org/l/calciumrole ) to learn more about the role of calcium. (a) What are "T-tubules" and what is their role? (b) Please also describe how actin-binding sites are made available for cross-bridging with myosin heads during contraction.
Answer:
(a) The T-tubules are inward extensions of the sarcolemma that trigger the release of Ca++ from SR during an Action Potential. (b) Ca++ binds to tropomyosin, and this slides the tropomyosin rods away from the binding sites.
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Attribution:
OpenStax College. Anatomy & Physiology, OpenStax-CNX Web site. http://cnx.org/content/col11496/1.6/, Jun 11, 2014
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