Sarcomere
The sarcomere is the functional contractile region of the myocyte, and defines the region of interaction between a set of thick and thin filaments.
This diagram of a microfibril includes the terms sarcomere, Z-line, M-line, thin filament, and thick filament.
Source
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"OpenStax College, Muscle Contraction and Locomotion. October 17, 2013."
http://cnx.org/content/m44788/latest/Figure_38_04_03.jpg
OpenStax CNX
CC BY 3.0.
