Cross-bridge muscle contraction cycle
The cross-bridge muscle contraction cycle, which is triggered by Ca2+ binding to the actin active site, is shown. With each contraction cycle, actin moves relative to myosin.
Source
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"OpenStax College, Muscle Contraction and Locomotion. October 17, 2013."
http://cnx.org/content/m44788/latest/Figure_38_04_05.png
OpenStax CNX
CC BY 3.0.
