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I band

Recommended video: Skeletal muscle tissue [12:25]
This type of tissue is found in skeletal muscles and is responsible for the voluntary movements of bones.

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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