Schematic representation of a sarcomer
The sarcomer or contractile unit is the smallest recurring structure used to contract strangled muscles. A sarcomer is made up of thick myosin filaments and thin actin filaments that overlap.
Light and dark bands are visible in a skeletal muscle under a light microscope. These light tires are called I-tires and consist of actin. The dark bands are called A-bands and consist of myosin. Each I band is divided into two by a disk of proteins. This disk is called the Z-line. The thin actin filaments partially overlap the thick myosin filaments on both sides of the A band. If the muscle is at rest, this will not be all the way to the middle of the A-band. As a result, the A-band in the middle is slightly lighter than on both sides of the center. This lighter belt is called the H-band. A sarcomer is the repeating part of Z-line to Z-line. Literatuurverwijzingen
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