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Mourning band definition, a piece of black cloth that is worn, especially as a band encircling the upper arm, to indicate mourning. See more.
The H band, within the A band, is where there is no overlap The Z-line is a dark line within the I bands Two Z-lines delimit the unit of muscle contraction - the Sarcomere During muscle contraction, sarcomeres shorten, the distance between Z-lines decreases - the width of the H and I-bands also decreases