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Graphical

CytoplasmSarcoplasmMyofibrilSarcomereA band

Definition

The appearance of the striated muscle is created by a pattern of alternating dark A bands and light I bands. A bands comprise thick filaments of myosin and proteins that bind myosin. They are bisected by the H zone, a paler region where the thick and the thin filaments do not overlap. The exact center of the A band is termed the M line.

Synonyms

A line
A-band

Category

› Cellular component

GOi

A band [ GO:0031672 ]