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# The sarcomere is defined as the segment between two neighbouring

( A ) H Zones
( B ) A Bands
( C ) Z Lines
( D ) I Bands

A sarcomere is defined as the segment between two neighbouring Z-lines (or Z-discs, or Z bodies). In electron micrographs of cross-striated muscle, the Z-line (from the German "Zwischenscheibe", the disc in betweenthe I bands) appears as a series of dark lines.