Excitation-contraction coupling
This diagram shows excitation-contraction coupling in a skeletal muscle contraction. The sarcoplasmic reticulum is a specialized endoplasmic reticulum found in muscle cells.
Source
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"OpenStax College, Muscle Contraction and Locomotion. October 17, 2013."
http://cnx.org/content/m44788/latest/Figure_38_04_06f.png
OpenStax CNX
CC BY 3.0.
