Actin filament is not present in which of the band zones?: (A) H band, (B) I band, (C) M band, (D) Z band
Answer is A. The myosin and actin filaments overlap in peripheral regions of the A band, whereas a middle region (called the H zone) contains only myosin. H-band is the zone of the thick filaments that is not superimposed by the thin filaments.