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I band
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The I band (isotropic band) is the light band of the sarcomere located between the two myosin (thick) filaments and contains only the actin (thin) filaments of two neighboring sarcomeres. Bisecting the I band and serving as an anchoring point for the two adjacent actin filaments is the Z disc. Either side of the I band is the A band which contains the entirety of the thick filaments.
During a muscle contraction, as the overlap of actin and myosin increases, the I band, as well as the H zone, will shorten, while the A band retains its width.
| Terminology |
English: I band Latin: Stria I |
| Definition | Light band of the sarcomere containing actin filaments of neighboring sarcomeres |
| Function | Shortens during a muscle contraction as actin filaments are pulled towards the M line |
Learn more about the structure of skeletal muscle with this study unit (and article):
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